> This isn't even what drives obsolesce of phones, it's software updates.

Agreed, and software-locking parts, like batteries, to only first-party or authorized third-party repair shops is one of those drivers.

I can see the argument for software locking some components (to cut down on theft) even if I don't appreciate or agree with them - it is at least a valid reason from some perspectives.

Batteries are a wear item though, and will have to be replaced periodically until the device is discarded. Software-locking them to only "Apple and people Apple likes" is unconscionable