Yes, I realise this. Using an email provider was a bad example for username recycling, and an oversight on my behalf. It was more pointed at, even the largest email provider in the world deletes unused accounts.
Recycling usernames isn't a risk on a website like this and is in use in many places.
I'll leave it at that though as I don't want to keep bothering you with replies. Hopefully others feel the same way and we get some votes. (Although I'm not sure how you vote as I don't see an option on any of these support threads, maybe I'm blind. :D)