The purpose of the report is not say what the update situation is across Android devices, Google has a monthly dashboard for that: https://developer.android.com/about/dashboards/index.html

If you're interested in the Android update situation, Adrian Ludwig just gave a talk at Next, the Google cloud conference about it (he even references the Wikileaks CIA breach): https://www.youtube.com/watch?v=Zm6ziX5pqt8

He talks about the task starting with only 5 OEMs to keep their flagships updated. And you start to see the insane complexity of running the update train: this meant 29 devices. Multiply by the 351 carrier partners, which goes to 5000+ builds and variants. That all need to be tested by all the parties. =/

The fact that the report doesn't even mention that there people like me that don't deserve updates, just because we aren't willing to pay over 500 € is what triggered me off.

The dasboard tracks versions in the wild, not the amount of users that were blessed with an update.

The report is presented in such a way, as if during 2016 the OEMs had a change of heart and now all provide updates.

Be careful what you wish for, my middle tier Motorola phone got an update a couple of weeks ago and has been crashing several times daily ever since. I'm not convinced their patching schedule is enough to make a real difference anyway.

It sounds Google like has an even bigger and more complicated mess to clean up than Microsoft! But they dug the hole themselves, it's going to take them longer to fix it, and they should have started on it years ago.