I'd use OpenBSD if it provided:

1. significantly faster vioscsi(4) driver for VirtIO SCSI adapters -- I can live with vioscsi being up to 2x slower than Ubuntu or FreeBSD, but 5x - 10x slower is probably a deal breaker for some other folks that would like to use OpenBSD on Digital Ocean, Linode, etc.

2. binpatches directly from OpenBSD, similar to the way a third-party is providing them at https://stable.mtier.org/

Other than that, really love OpenBSD and even their man pages are awesome.