btrfs has come a long, long way. At this point the only major remaining problem is the parity raid implementation, so most people just run it on top of mdraid. btrfs native striped and mirrored raid are stable at this point.
In my subjective experience, I've been using it for the last 6 years and have not had a fault thus far.
I'm giving it a shot once again (fourth time I believe?) but even Jim Salters article from last year really highlight the short comings. He does focus on RAID like you mention, however the tooling in general in full of papercuts as he shows and IME. https://arstechnica.com/gadgets/2021/09/examining-btrfs-linu...
I've been running it on my primary nvme drive for the past year and have had no issues and performance has been surprisingly good. Raid for a high-end nvme drive is a bit out of my budget.
