I do enjoy using OpenBSD from time to time but it’s clearly an OS developed first and foremost for OBSD devs. This is a fine state of affairs but it’s hard thinking of a good application for it beyond tinkering.
I wrote about it up thread but without a file system I can rely on using it on a router, web server and mail server - do people really bother running mail servers nowadays? - are disqualified. I don't even think it's a "well if you have good backups that doesn't matter" (cattle, not pets etc.) it doesn't have ZFS/btrfs style snapshotting which is massive step back in how I think of backups. The release cadence, upgrade cycle and speed also leave me scratching my head for actual production.
I did enjoy running it on my Lemote as a curiosity, but that port is dead now...my favourite part was the variety of arches it officially supported.
Again, as I stated in my comment, it's made for OpenBSD devs and that's fine - I hope they continue developing.