Most ideas not implemented in practice are just bad ideas. A few are undiscovered insights which become successful innovations, but most aren't used because they simply don't work. This includes direct coinholder voting. The reason is because the world is not numerical. Allow me to explain.
All kinds of things in the world can be bought & sold, but many cannot. For instance - loyalty. If you can buy loyalty, it's not loyalty - it's mercenary support. If you can buy love, it's not love - it's prostitution. For our discussion here, the relevant good is contribution. You can hire someone for a job, but you cannot buy their wholehearted passion & dedication. That has to be spontaneous & non-numerical.
Consider myself as an example. I have some BCH, but I'm no whale. If I were to dump all my BCH & leave the project today - what is the greater loss to the community? My coins, or my contribution? The coins would make no more than a momentary blip on the markets. But the loss of contribution would ripple throughout the ecosystem. The combined output drop of The BCH Podcast,
@bchbliss,
@bchblaze,
@SeleneWallet &
@TheBCHBullet all shutting down or reorganising without me would be titanic. Likewise, the secondary impact (e.g loss of morale) on other devoted BCH contributors I work with, and the tertiary impact on listeners to the show (also loss of morale or connection), and the quaternary impact on outside observers (loss of confidence) noticing my departure from BCH would be very significant. As things are, my influence in BCH governance (via the CHIP process) reflects my contribution more than my coins (which is appropriate and pragmatic). If changed to coinholder voting, my influence would drop dramatically, and likely also my interest in contributing. Why dedicate myself to a system which rewards only my numerically accountable net worth & not my intangible passion or output?
The truth is, dedication & coins are not distributed equally across the community. Many whales hold fat stacks of coins they never even check in on. And many dedicated contributors are barely solvent. If the whales could show up once a year for ten minutes to sign a coin vote crushing the preferred direction of the less-wealthy daily contributors, the essential core of daily community would quit the project in droves and the project would collapse from the inside out.
Let's consider another case. No community of humans - no country, company, organisation, tribe, family (or cryptocurrency) - allocates influence directly proportional to net worth. I'm not aware of a single country which votes proportional to net worth (or tax contribution), now or in the entirety of history. At most, very rough approximations are made (like only landholders vote). The leader of a country is rarely to never its richest member. Are the most successful countries the ones where a plutocracy of the rich has effective control? Generally, no. And they certainly don't have an explicit net worth based voting system enforcing it anyway, as that would create a populace revolution. Likewise in a family, if allocated by net worth the successful husband should be a justified and selfish tyrant. But in reality, he will weight his wife and children's feedback & needs far higher than their net worth indicates. This accounts for their non-numerical contributions (whether that be child-bearing, legacy importance, ability to cause emotional drama, future potential etc.) to the group as a whole.
Even in the case of a company, that you used as an example, shareholder voting is NOT the main decision mechanism. Daily decisions & influence are allocated to the CEO, C-suite, perhaps board of directors &/or singular major shareholders or key employees - and not as related to their share holdings but more to their perceived overall contribution or wisdom. While shareholder votes can & do happen (in the same way that a country can have a referendum, or an extended family might have a vote on a major group decision), they are reserved for singular moments (usually of controversial crisis). When things are working well, usually such explicit votes are not needed. Even when the shareholders DO vote, the outcome is not decided in reality by economic value alone (for instance a key employee threatening to quit may sway many other shareholders and affect the results outside of that employee's individual share holdings). The shareholder power to influence the company is primarily in *their ability to buy or sell the stock*, not in the shareholder votes.
This is also how it works in cryptocurrency. Holders can express their opinion on the market by buying & selling at any time. Doubly so in a (political crisis) chain-split, where they can buy/sell each side as they desire, and the market aggregates. This is already the direct coinholder voting you're looking for. But it's only appropriate for those moments of great crisis, not as a primary mechanism of decision making.
A direct coinholder vote mechanism (for example on a yearly upgrade) SOUNDS appealing in practice. It SOUNDS simple & "free market". But reality is more nuanced & is certainly not wholly numerical.
I'll give one last example. Satoshi proposed Bitcoin as a 1-cpu-1-vote miner governance concept. In reality, as we've seen several times, miners care little for governance disputes & usually defer to some combination of prominent developers, community figures, crowd demands or price action on the market. Bitcoin didn't work out as Satoshi envisioned, but it still works. It just needs to work in accordance with reality, rather than overly-simplified "free market" ideals.
Not coincidentally, the BCH CHIP process takes all of this into account - which is why it is delivering such great results. Apparently its overwhelming success (6 straight years of flawless upgrades & community cohesion, turned on a dime from a coin/community which had 3 disastrous chain splits in the previous 4 years) has not been enough for critics like
@Justin_Bons to recognise its wisdom & effectiveness. I hope that will change as the success continues, but it doesn't really matter because ignorance only penalizes the ignorant. BCH will continue shipping great upgrades, and Justin will continue to advocate for coin-voter fantasies which are not in use in any major cryptocurrency & almost certainly never will be to any degree of sustained success. This includes communities where Justin is active, despite his loud preference for this coin-voting system, he continues to hold & participate in all kinds of coins which DON'T do that, so his revealed preference speaks louder than this theories. He could also start a fresh blockchain with coin voting and make it an overwhelming success if it's such an obvious unexploited advantage, but we all know he hasn't, can't and won't.
Markets are numerical, but reality (and human communities) are not.