What's the incentive to do anything at that level? He's going to walk away after 5-10 years with OOM a billion dollars regardless of how anything he does or doesn't do pans out for Google. Why not just play the quiet card and pin anything that happens to the fiefdom lords who now have free reign and no oversight?
If good things happen, he gets credit for delegating well. If bad things happen, it's their fault. But if he loudly tries something different and it fails, the failure is more likely to get pinned on him. And again, he's already going to walk away with a billion regardless, so "financial upside" as a motivator for success is largely an illusion.
He's a "just gotta keep my nose clean and get out with a middling reputation and a shitload of money" CEO.
Sundar's role seems to really be give his lieutenants free reign which I guess makes sense seeing as how he now oversees all of Alphabet.