Aren’t we all? Aren’t Ext4 and ZFS considered mature because so many people have said “it works on my machine”?

I agree this person’s experience may contrast to your own, but I don’t think the fact that something has worked well for some people, and perhaps not for yourself, is a reason to discount it entirely.

Fair point, I’ve updated the readme now.

That seems to have done the trick, thanks! I still get a brief flash of something (presumably the Library window) when steam boots, but it disappears as quickly as it appears.

I’m on Linux, yeah. Admittedly I’ve seen some mentions of it happening on Windows, too.