Your wife made a decision most people miss because they are so used to skipping to yes. And wouldn't it suck if your IT department wiped your entire personal device including those vacation pictures of your recently deceased grandma. This happens way more often then you know.
This total control decision is why a container approach (give power to wipe what is the container only) to enabling corporate data is one I favor.
[0]: http://www.techrepublic.com/blog/smartphones/review-touchdow... [1]: http://www.androidpolice.com/2014/02/12/hands-on-nine-is-a-c...]
That's the bad news. The good news is this feature of Exchange also gives you the ability to remote wipe your personal device from Outlook Web Access (i.e. Exchange webmail) if it gets lost or stolen.