The main reason for android phons to slow down is the storage, most of the android phones run cheap emmc chips, even some of the more high end ones. Even with

The main reason for android phons to slow down is the storage, most of the android phones run cheap emmc chips, even some of the more high end ones. Even with a new battery and an AOSP rom, my Nexus 2012 is unusable even when I reverted to the version of android that that tablet came with, which is JB. So I don't believe that this will solve the hardware obsolescence problem.