It is still possible on a phone with stock-android to skip making an account at first start and use aurora/yalp instead. Maybe that's a solution to your problem?
With play-services I guess they still track a lot.
But: In my opinion every step counts and some is better than nothing. And even if you don't want to change os you can deactivate all google stuff I guess, all relevant stuff works for me without google services, so it should work on stock-android too.
Sorry for bad english. So it sounds sometimes rude.