I'm sure its been mentioned before, but I just can't get over the fact that they don't lock.
I'm not concerned about the hose popping out, I know it's secure. I just hate how much pressure is needed to secure / remove it. I have mild tendonitis in my rt elbow, and so this even even more important to me (and probably lots of older users) but even when my arm was OK, I found removing the hose a minor PITA.
Bosch has an anti-static, twist-on connector, so it certainly can be done.