I applaud your ability to do this (seriously, genuinely, I do), but if you truly believe what you do is normal, just "what one does now", I must inform you that you live in a very small bubble.
I would like to run GrapheneOS on my phone, but I like being able to use Google Wallet, among other things. If I look at what I use my phone for, way too much of it relies on Play Services, and (critically) the SafetyNet (or whatever Google is calling it now) checks passing.
This situation blows. I really don't like these trade offs, and iOS's trade offs are different but no better.
Also, fwiw, you can install Play Services after installing GrapheneOS[0]. It runs in a sandbox without the same deep system access that it has on less secure versions of Android. There's no requirement here to authenticate with any Google account. You'd just have the Play Services running/available, which can be a requirement for some apps.