If we think of the Tesla as a computer with wheels, there are some useful analogies. Apple prides itself on accommodating its new Mac OS and iOS versions on its older hardware, but at some point the features designed for much faster and capacious machines just can't be shoehorned into the legacy boxes.
I think the same thing inevitably happens to Teslas. It's not so much a matter of policy as of practicality.
Logical. But as far as I know they haven't yet made any hardware changes to the computer behind either display, right?
I know the driver's panel itself has been upgraded, and they went to LTE (but offer an upgrade for that.)
Certainly Pre AP and AP1 cars won't be able to benefit from much of the AP2 eAP/FSDC development, but I don't see why they can't handle everything else Tesla comes up with for now.