> I'm not convinced these sorts of cross compatible upgrades will continue to surface into the future

They've already outdone every other laptop manufacturer: you can swap a new 13th gen system board into an original 11th gen Framework.

My friend's wife has a Framework, and she suffered a liquid spill which reached the system board. He ordered parts, did the swap, and she's back in action for less than half the cost of a new laptop. If it were Dell or Lenovo, you'd be trying your luck with used eBay parts. The housing would have ~20 tiny plastic clips that you break one or two of every time you open it up. (Or adhesive, ugh.) It's just a sketchier proposition.