It is not just about privacy. With Android phones, you will sooner or later end up in a position where you can't install newer LinageOS versions, simply because your kernel is too old and the required binary drivers cannot be ported to newer kernel versions. Maybe project Treble helps to solve that problem, but it will still take a few years until we will find out (unless Fuchsia kills Android).

Nevertheless, I hope that Purism will be able to deliver a product which is as easy to use as a "normal" Android device with those privacy/sustainability features as a bonus. That way I might be able to give the people who ask me which phone they should buy next some good advice.