Family plans are great for businesses that want to subscribe (which we probably would). Each person needs to have an account, an invoice, and a different subscription.
It would be beneficial to have the family plan interface for enterprises/businesses.
I showed my family plan to a coworker, and they loved the recent new features (wolfram, summarizer, instant answer, expert assistant, latest models' chat).
Single, Duo, Family plans get a fourth one : Enterprise :-)
Same interface as the Family plan for managing users + ultimate addon.