Earlier quoted context omitted.
The problem is that each OEM releases 50 different models per year, vs Google (or Apple) that release 3 or 4 models.
If that truly is an issue then Android is a fundamentally broken OS. How many different models of PCs get released? How hard is it to patch any of their OSs?
(E.g. Samsung still limits Now brief to latest devices even though it is a 99% software feature + 1% cloud with 0 hardware requirements.)