I still think you're confusing the terminology.
And the order in which things are done.
But it's true that DA may not be right for you.
Have you read the
Site-Helper site,
Site-Helper for Resellers, or
Site-Helper for Admins?
On DirectAdmin, a server administrator creates a reseller. A reseller creates a user. A user creates a website.
And then the user creates email accounts for email users.
On DirectAdmin a
user is a person who controls a website; some other hosting panels may call that a site-administrator.
It is true that with DA there's only one user and only one login for a website. And that user also has access to the control panel.
So if that model doesn't work for you, then you probably shouldn't be here talking about Plesk, but rather at the Plesk forum, learning how to use it.
Of course msn.com doesn't have only one site administrator. But then again, they host on a rather complex platform they built themselves, as do most large companies.
DA was designed for hosting companies to offer simple shared hosting solutions. Perhaps it doesn't work for you. It certainly doesn't work for some of our clients; for them we develop other solutions.
But for the majority of our clients, DA works well.
Jeff