Yep, it's really annoying how Google forces all their services to be completely integrated together, and not even integrated well. Lots of issues with glitchy account switching.
Where does your account flack? I use my Google account for almost everything as I move from one thing to another and it is probably one of the biggest reasons I chose a Google service where given a choice.
I hate having to log in and remember passwords. So something like Google WiFi love able to just use my Google account. As well as Google photos, home, email, bookmarks, docs, drive, YT TV, YT Red, voice and even unlocking devices and such. Love even my wifi password being passed by my device instead of having to share.
I look forward to when my Google account unlocks my car and starts it.