they advertise/tout you can use your account on multiple devices, but that is definitely not true.
The system they have for account sharing is a little strange, at least with the family plan, where instead of having everyone on one account (like what netflix does/did) you instead have to link different accounts to the one that pays for the subscription.
I don't think they claimed it was better, just that some people prefer the control it gives them and also the feel of it.