It would be nice to share my Proton Unlimited plan with my family.

Personally I don't need 500GB per person or 15 email addresses per person, and paying for those features person with a business account at a higher rate than the unlimited plan just doesn't make sense.

It would be nice to be able to enable the Multi User feature for an individual plan and allow them to allocate storage amounts and other resources to individual users as well as manage domain addresses. I could see charging a limited additional user fee for the account of $1 per additional user.