What if framework created physical adapters for mainboards so you could put any smaller board in any larger machine? If someone wanted a framework 16 sized machine but only needed the CPU power of a F12 they could have both (the extra 2 unused expansion slots could just hold other cards or be filled in)
Biggest obstacle to achieving this would be thermal management. If this were possible would it be worth it or just add too much confusion to the framework buying process? There is something to be said for not overwhelming customers