[LocalH]

Any phone that gets more support than it should have, such that the only OS you can install is too slow to make using the device enjoyable, makes it more likely for the device owner to throw that device out, and then it becomes e-waste.

It also harms software preservation. Sure, we have IPSWs for every single public build of iOS that exists (and if you dig around, probably a ton of betas and even internal builds). But you can't really do anything with any of them once you get to the point in the iOS product line where things were sufficiently hardened