I have a domain for my family with Fastmail. I miss the old family plan. The parents and children in our family have wildly different levels of email usage. A family plan would allow us to share pool resources instead of paying full price for barely-used children's account.

We are on a grandfathered plan now and are putting off upgrading to a current plan as long as possible because it's a huge price jump to start paying for my kids to have 25 GB of storage which they are barely using.