A household account is more than just Youtube. It's sharing AI subscriptions, Google One storage, purchased apps and media etc.I'm obviously being really thick as I still don't get why you'd get that.
We have standard at the moment, I can be watching something on my iPad while indoor cycling, as my partner watching something downstairs on the TV. (logged in on the same account)
Should we technically have a family account if multiple people watch at the same time?
We each have individual email addresses and can use all of those features independently, using our own information etc. And as mentioned, you don't get overlapping recommendations - so I can watch what I want to, and the kids can watch nursery rhymes etc without me getting fed all of that by the algorithm.
Though in my case, I don't actually have Youtube Premium right now because I won't pay what they want and got tired of the geohopping.

