They're really not incompatible -- iPadOS is really just a reskinned macOS. Under the hood they're essentially the same thing. There won't be any phasing out

They're really not incompatible -- iPadOS is really just a reskinned macOS. Under the hood they're essentially the same thing. There won't be any phasing out of macOS -- it really wouldn't make any sense at all. They'd alienate all their devs.