agreed. have seen this in my own tinkering with iOS apps, very easy to build now. the one point I disagree with tho is that its still hard to build something good - good UI & UX, simple and easy to use, reliable, etc.
I think the challenge is that everyone can now build apps
But
1) almost nobody has distribution (like an audience), or
2) the money to pay for distribution (ads or UGC), or
3) the creative genius to get distribution for free (classically called guerilla marketing)