i don't think it makes sense to have a new generation that has no single part compatible with the current one because the current one doesn't really have specific flaws overall that can't be addressed by a new part, and so far it has happened (top cover, speakers, hinges).

personally i don't even think the fw13 has saturated the customisation possibilities (new screens, ARM, etc.), which probably says more about how boring the laptop world has become, rather than fw's limitations.

it's not exactly the same though, which is what matters if you want to make parts compatible

the speakers really are framework's achilles' heel and there is no reliable fix unfortunately. there isn't a general issue with the screen ratio (it's a matter of taste and i'm sure you'll get used to it quickly), but the weird resolution and the fact that it forces fractional scaling is still a bit annoying on linux, comparatively.

on arm: there's been a lot of speculation, for a while there was no viable option but a new challenger appeared and i'd be surprised if framework hadn't started talking to them yet.