I agree. I've been proposing something similar to this for years. I've always thought Bethesda should display our game version (XBox, PS3, PC) under our avatars.
I've spent a lot of time answering questions about these games. And I can't tell you how many hours I've wasted writing up a detailed answer to a question only to find out later that the questioner wasn't on the platform I assumed and that all my efforts were for nothing. Or, what's almost worse - being forced to ask what platform a person is playing on and then waiting and waiting for a reply before I can properly answer their question.