I think this makes sense for many low impact scenarios, but there's always going to be a set of services that I dont want to trust to the same provider. For me its my bank, even though passwords have plenty of flaws, and i am trusting my phone to protect tap pay tokens, i would never link my bank login to my google account so I use a memorized password.

of course this is tinfoil hat territory because a threat to my passcodes would probably involve breaking the security systems on android.