Re: Awww.... come on !
"The whole point is that Google are showing that it's entirely possible to bring updates out, consistently, and frequently."
I don't quite see why people miss the big reason why non-Google phones have a longer delivery cycle. Have you ever used a Google phone versus another manufacturer like Samsung? If you have, you'd notice the obvious difference. Samsung has put a lot of work into making their interface consistent across all of their devices via the TouchWiz interface. If you compare the S4 through the S7, you'll notice that all of them operate very similarly (interface-wise). Google simply takes what they've created as stock and slaps it on the phone. When a new release comes out, they can easily deploy it because everything in the release is basically exactly what goes on the phone. Samsung has to update, tweak, and compatibility test all of the customizations they have made to integrate them into the new release. If Samsung ran stock, I'm sure major updates would be released a lot faster. If you look at the security point releases for the S7, Samsung actually keeps pace quite well.
You also have the issue with carrier tie-in. It's why the Samsung on AT&T can receive the update on a different timeline than the exact same Samsung on Verizon. Each carrier will want their own control over how things are built to make sure their own cruft gets included.