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> Why does btrfs have those issues compared to other filesystems?

Mostly because it has lots of features and as a consequence, is pretty large and complex. Closer to ZFS than ext2.

Btrfs suffers from a initial bad rep, which is difficult to overcome.

ZFS itself seems very stable and not to suffer from these issues though.

Anecdotally, I've encountered issues with both ZFS and BTRFS at about the same rate. A public example of an apparent ZFS performance issue is https://github.com/openzfs/zfs/issues/9375 Both are much more quirky than simpler filesystems like ext4. Data integrity verification from checksumming makes it worth it though.

The ZFS vs. BTRFS choice, I think, depends more on whether you need specific features like offline deduplication or L2ARC / SLOG cache devices. And which one you're more familiar with (can troubleshoot better).

ZFS is also extremely well designed at a system level... which is not the impression I get from BtrFS. (Disclaimer: I have not bothered looking at BtrFS for years because ZFS has handled everything I've thrown at it very admirably. Including complicated setups with RAID-Z, etc.)

Granted, there are some limitations to the design, but it doesn't affect my use cases, so whatever...

Good theory, thank you.

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