You don't mean other users under Admin. Example by default DA creates admin. Admin is both Administrator and Reseller. Are you saying it best to not use admin as reseller to other users OR just don't host any domains under the admin user?
First of all it's only MHO. I don't say not to do so. My concern is about:
1. security, it is safer to host 1-3 sites per account. And if they hack 1 site or account, the other sites and accounts might survive if they are owned by a different user.
2. backups, it is easier to manage backups containing 1-3 sites, than 10+.
3. server load, it is easier to track server load on per user bases with 1 site than per account with 10+ sites.
4. limits on number of processes and connections.
It is not seldom when users with DirectAdmin servers add all their possible sites under a default admin account covering themselves with a simplicity of using FTP with one login/password to manage sites, ignoring security and possible issues with limits on number of connections/processes per an user.
This needs to be fixed to more easy set.
Yes, agree, it should be fixed in Evolution skin.