Agreed, but not just for Proton Pass, the whole family plan is a bit much, and I wouldn't even use all of it.

Right now I only have two users (myself, and another). I would love to only have family plan for those two users, and pay a fraction of the full price for just those two, rather than the whole price for the full six.

However, what if I had seven users? What if I had 50? It would be nice to pay to add more, like in a Business account.

It would also be nice to adjust the shared storage and resources between the users, as well as to adjust plan details per product, so as to be able to mix-and-match what my family plan needs attached to it, and pay more on an itemized level, rather than on a "pay for everything and only use some of it" level (you know, like a business a account).

Not everyone needs 90 aliases, 10 domains, 3 TB storage, and 10 VPN connections per user, I only need 1 TB storage, 2 domains, Maybe 10-20 aliases, and only 5 VPN connections per user. I like Premium VPN as well and will stay on it, but what if in principal I wanted to downgrade just VPN?

However, I would happily pay for more of each of those resources if that's what I needed (you know, like a business account).

If I could have more flexibility in what I could purchase with the family plan, I don't need much for our personal email experience.
If this were the case, then I'd use the savings from the family plan to separate some of my work resources/domains/needs into, you know...another business account. :)

Agreed! Family Plans should be charged per user just like business accounts. It would be cheaper for me to buy a business plan for the 2 users I need on the same domain.