OpenBSD had Soft Updates, which isn't really journaling but sort of similar. It was suppose to help with with file system integrity, in the case of crashes. OpenBSD removed it last year because it got in the way of VFS updates, and was hard for the team to maintain[1].

I love OpenBSD, but it really does need a modern filesystem. The current team might be to small or just not have the right people to do a new filesystem. HammerFS2 could maybe be ported (and one has to wonder if that's not one of the thing that would requires VFS layer updates). Much of the current work on filesystems are being poured into GPL licensed code or ZFS, which also have an unfortunate license, so OpenBSD either has to borrow HammerFS, or do their own thing, which they probably don't have the resources for.

1) https://undeadly.org/cgi?action=article;sid=20230706044554