It might sound odd, but when there is a level of expectation that diabetes is a life sentence, it's nice to go out and show people that it isn't and that you can live a successful life in spite of it.
To put it another way, I've played cricket in multiple places around the globe, am in the midst of my second career and (I'd say) successful at it, and have not been stopped from doing anything I wanted as a result of it. And I'm 40.
The point being that it doesn't stop you unless you let it. Would I have had a different life if I hadn't been diagnosed T1? I can't say. What I can say is that it hasn't stopped me. It's not a case of there being positives or negatives. It's simply that having a long term illness or disease is not a life sentence. It's simply something to carry on and live with.
It doesn't define us but it helps to shape us. We can choose whether that is a positive or negative thing.
Have a read of this:
http://crick-tech-munch.blogspot.com/2016/03/my-diabetes-my-way-or-how-to-set-up.html