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I don’t know. According to this : https://www.statista.com/statistics/921152/mobile-android-version-share-worldwide/ android version 13 and 14 account for almost half the device versions, and those usually have forced auto update and also recent enough to be getting updates in theory…
That is a difficult topic. Google did take steps to mitigate issues there. Android got Hardware Abstraction Layer to prevent blobs from blocking updates ; also, a lot of updates were moved from AOSP to the Play Service, so Google can more easily roll them out. (And to make AOSP and 3rd party roms less of a threat, eh.)
Edit : that said, most android phones have woefully short support period.