I don’t think most apps even access sensors. I also think disabling it is not necessary, more so if you don’t allow network for an app. Though some (google) apps may still send data to Google via Play Services, supposedly.
I wouldn’t worry about it, but you need to decide for yourself. Usablilty is also an important factor, pixels aren’t cheap at least where I live.
With Bitwarden, you can use passkeys on chromium browsers. Vanadium actually enabled support in advance.
You need to have Play Services installed, though. This is due to Chromium, nothing GOS can do about that. No need for even network permission for Play Services, luckily.
Firefox is supposedly adding a standalone implemetation, which won’t require Play Services, any year now…
Don’t have Proton Pass, so don’t know what’s the situation there. With BW+Vanadium, they work well. I just wish Play Services weren’t required. With Google Passwords they probably just work.