There's so much work involved to develop a game depending on the level of complexity of the systems designed.
Some do it part time, and some of us are lucky to be able to do it full-time (with all the economic stress that comes with it)
And beyond just some cool looking graphics, and some fun gameplay, you have to add self-promotion, UX design, management if you have employees or work with freelancers, etc, etc.
I would say it's all worth it at the end of the day , though.
"Why is that indie game still in development!"
you have to understand a lot of us are not doing this full time... we cant afford to, some of us have day jobs
sort of thing has become increasingly common as publishers are not generous & increasingly selective
self publish