Five years ago I believed this same thing, exactly as you described. I went all-in on Google services and left all the options to send them data on, trusting them to be the benevolent system you described. And believing that the benefit I was getting in terms of cool UX would be worth it.
Now with how horrible ad-tracking has gotten, and the decline in Google's products (Inbox especially, for me) the shine is wearing off quickly. I'm strongly considering abandoning the Google platform as completely as possible whenever my Pixel 2 bites the dust.