It would be a REALLY simple thing to implement for longer and get the PR boost/spin. considering there are still so many devices that are working that don't support newer software. BRand loyalty is waning and windows is competing with chrome books. That's the shit k-12 are getting and most basic people. Give yourself at least a bit of an edge ffs!
But nah public hasn't made a big fuss about that so of course they won't elect to make better choices for the environment