Well, android is open source so manufacturers can add their stuff and manufacturers decide when to update their devices (if at all). Google is being more strict on updates, as well as adding Project Treble which makes updating a device a breeze.

That's like saying Linux hasn't figured out updates yet. It's a false argument.

At the time... yes. That's the point of an acquisition - to buy talent/skills/tech when you don't have that talent in-house (or to augment existing talent).

Now, many years later and with normal amounts of turn over? That's a different question all together.

Yes of course. The parts of Android and Waymo that matter most were already built, or are being built, by folks from the acquired company.

And no one loves Apple because of iOS...