Like many companies that stop innovating, it's not the engineers who are in control. "Tonerheads" are. Raghaven has Search under his thumb. Ads is putting on pressure for revenue, and their incentives are not entirely aligned with Search.
I didn't know what "tonerheads" were. First Google search for the term gives a reddit link and enough of a summary to understand the meaning. Presumably people aren't trying to make money from that search...