Yep. But that's why we've unified the family plan levels to be the same as the personal ones.
So the only difference now is it's $5/y extra to have the family "container", which lets you create accounts in your own domain rather than having an @fastmail.fm account and aliases. Having that container then also lets you setup multiple accounts, manage them, share folders between users, etc. If you only have 1 account, then yes, it's a bit annoying, but I don't think $5/y is too onerous.
So the only difference now is it's $5/y extra to have the family "container", which lets you create accounts in your own domain rather than having an @fastmail.fm account and aliases. Having that container then also lets you setup multiple accounts, manage them, share folders between users, etc. If you only have 1 account, then yes, it's a bit annoying, but I don't think $5/y is too onerous.