Astrometric controllers have this feature too. Its saved my bacon numerous times. When power is lost, the UPS kicks in, and the astrometric controller shuts the dome. That
causes ACP to crash but that's OK, the gear is safe. I don't know what happens if a Boltwood goes away, but, if it does, I think ACP loses weather, which create unsafe weather which also would
close things down in an orderly way. The Astrometic controller sends me an email so I know their is a problem and can intervene.
Peter