I once knew a system with 400 members. That's not common, but it is a thing. Systems of around 10 people are very common. Discord only allows up to 5 accounts. And only up to 1 account on mobile. And besides, having to maintain separate email accounts, even for a small system, is a burden. What about walk-ins and dormancies? What about new members who are still figuring themselves out and might want a change of name later? Pluralkit makes it all simple.