Again, that you want, good for you. But when Google let people choose, and people choose in a way they didn't like, they immediately reversed course, pressured OEMs to make that user choice harder.
That's fine, but your comment makes no sense in response to someone who explicitly talked about their personal threat model. Of course they can grasp that other people have different ones, that's why they scoped the comment to their own.
I think it was pretty relevant nonetheless because by tweaking the UI and UX Google is actively harming their users abilities to implement the threat model they have chosen (no matter which one they choose).
Whether or not this is true, it's far from the original question. OP's question (in my reading) presupposes permission to monitor healthcare data. If you believe the xoogler and googler responses in this thread, Google's data stewardship will be superior to that of other people doing healthcare ERP stuff. So the only question is if Google can do something without ads tracking, and the answer is yes. Gmail and Docs and Drive isn't used for ads purposes (granted gmail used to be, but even then it was siloed and only used within gmail). It's just a freemium model.