Raid 5/6, only bcachefs will solve it

I am using btrfs on raid1 for a few years now and no major issue.

It's a bit annoying that a system with a degraded raid doesn't boot up without manual intervention though.

Also, not sure why but I recently broke a system installation on btrfs by taking out the drive and accessing it (and writing to it) from another PC via an USB adapter. But I guess that is not a common scenario.

For my jbod array, I use ext4 on gpt partitions. Fast efficient mature.

For anything else I use ext4 on lvm thinpools.

Meh. I run proxmox and other boot drives on ext4, data drives on xfs. I don't have any need for additional features in btrfs. Shrinking would be nice, so maybe someday I'll use ext4 for data too.

I started with zfs instead of RAID, but I found I spent way too much time trying to manage RAM and tuning it, whereas I could just configure RAID 10 once and be done with it. The performance differences are insignificant, since most of the work it does happens in the background.

You can benchmark them if you care about performance. You can find plenty of discussion by googling "ext vs xfs vs btrfs" or whichever ones you're considering. They haven't changed that much in the past few years.

I run it now because I wanted to try it. I haven't had any issues. A friend recommended it as a stable option.

Used it in development environment, well I didn't need the snapshot feature and it didn't have a straightforward swap setup, it lead to performance issues because of frequent writes to swap.

Not a big issue but annoyed me a bit.

Do you rely on snapshotting and journaling? If so backup your snapshots.

Btrfs only has issues with raid 5. Works well for raid 1 and 0. No reason to change if it works for you