Sure, and that's a reasonable thing to want. That's still not what the right to repair is about, though. It's about preventing arbitrary restrictions on your rights to repair, not about forbidding practical limitations on your abilities to repair (unless of course those practical limitations were created in order to impose arbitrary restrictions on your rights).
If Apple decide to integrate the battery & screen to shorten the electrical paths to that power-hungry component, then the battery becomes effectively non-replaceable. That might annoy you, but it's not a violation of the right to repair.
On the other hand, if Apple do things to ensure that only Apple repair shops can replace the battery (eg via cryptographic signing, secret APIs, or physical keys that they prefer to call screwdrivers) then they've run afoul of the right to repair movement.
There may be times when it'd be good to mandate replaceable parts (environmental motivations come to mind), but that shouldn't be the default -- those restrictions should be applied to individual industries in narrow ways and only as needed.
The right to repair movement is pushing for something that reasonably could be the default, and we would instead make exceptions for things that shouldn't be generally repairable (eg, perhaps modifications to an odometer should be tightly controlled.)