Good news! There is a phone for you. Android allows that. Why not allow others who want their device partially controlled by the vendor to have that option?
I agree with the GP and prefer the current iOS landscape.
Yeah but you can still use software like Magisk to fake out whatever detection mechanisms they used. With hardware remote attestation, it will be impossible to do that.
For now. Remote attestation is already a thing and soon Android apps will refuse to work on phones that have been "tampered with".