Last I checked OpenBSD lacked any support for Wayland (I tend to use SwayWM; it is supported on FreeBSD I believe, though realistically Linux is going to have the best story here for now.) I also don’t believe Docker runs natively, which is a pain for some stuff. I don’t expect most commercial software (REAPER, IDA/Binja, etc.) to really support BSDs either.
I run multiple machines so it’s not a huge issue if one OS doesn’t do everything I need, but I expect roughly all of the things I want to do to require some kind of VM or emulation under BSD, if it’s even possible at all. So for me, the value proposition is limited. It just seems like more stuff to learn, and I’m not entirely sure what to do with it.