I'd say Google is showing signs of too many captains on the ship when it comes to tech. I'm not going to bore you with all the examples that are being cited elsewhere in this thread but there are plenty of things where people are raising eyebrows lately.
A CTO's role is to provide clarity internally and externally on what a company is doing technically. In absence of a CTO, that role is for the CEO. Pichar is not enough of a credible leader on this front.
E.g. Steve Jobs was a clear visionary leader. Bill Gates was a clear technical founder CEO. They did not need CTOs. Amazon has an effective business oriented CEO that defers to a very strong CTO (Werner Vogels) for technical things.
AWS is no accident; that requires technical leadership (Vogels) and long term strategic thinking (Bezos). Google just got leapfrogged by MS in the same space. I'd argue lack of leadership is a big reason.