Don't forget that every 2021 will be built to individual customer specs as opposed to what a dealer orders to put on the lot. Yeah, maybe won't matter, but those of us who get one will have a little piece of automotive history attached to us for as long as the vehicle exists...
I have my doubts that any of the computer stuff will still work - let alone have support - 30 years from now. I doubt you can find service/parts for 30 year old computers now.
Maybe there will be a way to switch out the central unit for something modern down the road? But I can't see Ford still supporting 30 year old computer hardware down the road.