Many people don't understand that the effort and time going into making a game like this is pretty much a full time job, except most of us work an actual full time job on top of it to pay the bills. Burnout is sadly pretty common for a lot of devs.
Working on the game is crazy tedious, but wanting to see it all come to life is what makes it worth it. And of course, even more worth it when there's people enjoying the game