What the phone repair companies want is to be able to buy parts (without all the weird rules that apple has for licensed companies now).

The repair shops can figure out how to glue a screen to a housing on their own. The problem is they can't buy new parts, and they can't swap used parts because of software locks.

Apple very much found a way to allow repairs while preventing it from being profitable, and it's likely John Deere will (try to) do the same.