I would prefer to have the usernames of list admins on the main page again.
Don't know why they are not visible, but it is quite annoying with small lists that you cannot approach a list-admin in person if you need them.
I can imagine with bigger lists, and open registrations there might me problems with having the usernames on display, but with invite-only it should be an option to approach people in person (instead of through admins@), especially if it is urgent and you want to be able to reach out through other ways then just email - some people are more responsive on Telegram or IRC for instance.