Benefits? If you are not developing _for_ the platform or don’t have specific use cases (e.g. package creation) literally none. It will be an uphill battle where you will spent man-hours trying to find workarounds to things elsewhere are trivial. Or have another system laying around which IMO beats the purpose.

If you are an OS & BSD aficionado, you like to spent time working with OpenBSD because <reasons> ok, but otherwise I would advise against it.