Google can technically access my phone since I am running their operating system, but everything will be encrypted and there is no reason for them to single me out of their millions of users.Well, if you use Android, obviously Google will have access to almost everything you do, your number, your number of contacts, your email, what you search for, your location (where you live, places you visit), and other things, you can even avoid many things, but 100% privacy there is no friend.
They do not have access to my number, my ISP does. I don't care if they see who I talk to, so long as they don't know what I talk about, and again, there is no reason for them to spy on me specifically.
They don't have control of my email or what I search for. I am not using their email service, search engine, browser, or DNS.
As far as location, I purposely allow them to see so that I can use the Find My Device app. I chose for that to be in Google's hands, but if I cared about hiding where I am, I could change that. Also note that I disabled the option for them to keep logs on my location, so by policy, they can not log where I am.
I agree with your last point. If I wanted 100% privacy, I would have to move into a cave with food rations and EMP's. Even then I can be spied on. But good privacy is a lot better than no privacy, and I am very aware of what Google is capable of since I would be using their operating system. But like I mentioned before, they have no reason to single me out, and as far as what they can log, I kept it limited to what I am comfortable with.