Comment by kodebach

I can't prove it, but I still think this is (partly) due to a recent EU regulation majorly backfiring. I can't remember which one it was, but one of the recent regulations mandates that devices get updates for a certain period. Within that period a manufacturer must provide each update for all their devices in a short timeframe. The intention was to prevent flagships getting updates immediately and lower end devices having to wait months. However, due to some (also well intentioned) wording about open source, the release of the source code is counted as the first release of an update and starts the timer. I'm pretty sure Google is delaying public AOSP updates to give their partners (mainly Samsung I suppose) more time to finish building their updates on top of AOSP.