Google has (or until very recently had) some of the best researchers in the industry. Google's problem isn't developing new stuff, it's turning stuff they come up with into a viable product and then developing a market around it. All of their most successful products (search, gmail, maps, youtube) were developed at least a decade ago. They've come up with decent technology since then, but they seem to have developed a catastrophic inability to actually build a business around any of it. The failures of Google+, Duo/Allo, Inbox, Stadia have nothing to do with technology and everything to do with managerial incompetence.

Google could be sitting on the most advanced AI on the planet, but none of that matters as long as they're under the current leadership.