Switch controller gets used for flight simming, just as a simple analog input that I can take to the couch (or bed). I've also got a wired pair of my wireless Audio Technica headphones, but I'm not confident that my DAC (or Bitwig for that matter) would work as well on OpenBSD as it does on Linux.

For desktop use, I don't think I'll ever end up on OpenBSD. It might power my gateway router one day, but the cost/benefit analysis falls through on hardware like a laptop or gaming PC.