Some of them are grounded in Linux politics. I have hope in bcachefs but best not rush, we've all seen btrfs.
But yes, bcachefs is somewhat interesting. Or maybe btrfs manages to clean up their act one day.
There were RFCs on proposals to address both the write hole and quota issues on LWN this year, with the write hole fix already having draft patches see "raid tree".
BTRFS is fine if you are not doing things that can hit those edges.
Miles better than all that geom_xxx RAIDs (I've been maintainer of geom_raid5, mind you), chipset RAIDs and FFS2 SU+J stuff, which is not completely stable even right now — I've got a ton of erros from forced foreground fsck after "normal" background fsck completion as soon as 2019 (I don't have single R/W FFS2 after that, and I'm happy!)
With all my due respect to McKusick, all this modernization of FFS2 (SU, snapshots, SU+J) always was very fragile, and software RAIDs implemented as GEOMs is much worse than ZFS VDEV layer.
Linux-induced changes downgrade ZFS performance a lot, though :-( Another level of indirection in ARC is really big deal.