ext4 has "recent" correctness and corruption bugfixes. Just search through the 6.x and 5.x changelogs for "ext4:" to find them. It turns out that nontrivial filesystems are complex things that are hard to get right, even after decades of development by some of the most safety-and-correctness-obsessed people.

I've been using btrfs as the primary filesystem on my daily-driver PCs since 2009, 2010 or so. The only time I've had trouble with it was in the first couple of years I started using it. I've also used it as the primary FS on production systems at $DAYJOB. It works fine.