For example, my impression was that had Android assimilated into the wider Google they would have failed. The wider Google views the fact Android isn't Chrome OS as a strategic failure, but the truth is wider Google doesn't understand how to work with other companies. The Android unit did have certain ludicrous habits (I recall huge laundry bins in the reception of their building at one point) but the reason for this was they understood what was at stake. (People forget just how much needed to be done between Android 1.6 and 4.1 to stop the iPhone completely running away with it, although that effort has now been effectively squandered). There have been other units that also fail to assimilate and then just peter out, but Google under Mr Pichai never learns from acquired companies, it just imposes their way on to them. If you came from the Chrome side of the fence you wouldn't notice this because it was your way being imposed elsewhere.
Mr Pichai has always had a singular vision, to be CEO of Google, and then stay there. What to do with that never seemed to cross his mind.