Never ask that question.
I can see it now.... Macs with ARM inside, which require annual replacements to a non-user replaceable battery in order to maintain their advertised / original speed lest the CPU be throttled to avoid a random sudden shutdown that would otherwise result in a potential loss of user data.
Oh what fun ....
Given that apple’s chips suck less power than intel’s, switching to A12 or whatever would be a step up for battery management.