I can only really think of one reason to set up this homebrew server, and that is to avoid records searches, FOIA requests, etc. Anyone with a smartphone knows that you can have multiple different email accounts going to your phone. This idea that she needed one account so she didn't have to carry "multiple devices" is silly. 

As a private sector employee, I can't see any scenario where anyone I work with would be allowed to have even a gmail account for work rather than the company supplied email account. 

For an administration that promised to be the most transparent in history, this doesn't quite meet that standard from my perspective. It reminds me of other officials that had fake names to avoid FOIA requests from their official email accounts.

As to what we are missing, we may never know. Hillary and her staff could have been up to anything and we'd never know at this point unless the Russians really did hack her server and plan to release them. Not sure how she can be trusted.