[foverzar]

> What does "multiuser" mean to you?

It means separate app data, so I don't have to tediously re-login in spotify, messengers etc.

> The traditional home PC was shared by everyone in the family, all using the same account.

Not really and even if so, the separation of concerns is much easier. For traditional PC I can get by with a separate browser profile.

For mobile OS with mobile apps, each having an account or personalisation features, it's just non-usable.