Since I already host a bunch of stuff, it hasn't been a big burden for me. I get to laugh any time one of the popular instances goes down or has some admin/mod controversy, but the tradeoff is I have to manually subscribe to everything since I don't have an "All".
I mostly did it because this is the only way to truly own your lemmy identity. I hope one day it will be possible to link accounts on different instances together so that migrating doesn't lose your history.