iCloud mail separates from iCloud account in OS X 10.8
Under OS X 10.8 Mountain Lion, iCloud appears to separate the email account in System Preferences > Mail, Contacts & Calendars if the main account for iCloud is an alias.
If you go to the advanced settings on iCloud.com, iOS or OS X Mail; you can specify the default account to send iCloud mail from, another alias instead of the "main email". However, by doing so, in System Preferences, the iCloud account appears to "turn off" it's mail account and set up a separate one. Rather than just keep the two merged - it is still iCloud after all. (OS X Mail also seems to not detect this new iCloud mail account as a 'proper' iCloud account. It is no longer floated to the top of the list, nor are the mailboxes).
Additionally, if the setting is changed back to the default account, the two become just the one "iCloud" account again.
It's baffling, and just seems like a large bug. For me, iOS and OS X has always represented a notion of user ease-of-use and "it just works".
Whilst this doesn't actually break anything, it just seems absurd. It's a minor bug, but one that's bugging me.
Is anyone else having this issue?
13, Mac OS X (10.6.8), (Late 2009)