I love them! The ride in this morning, in -17F windchill, was so much better than with gloves. I had on a light pair of gloves under these and was good to go.
I'd hazard two things about the "attached" comment:
1. If you can't get your hands out of these quickly, you probably couldn't get your hands off quickly before. They are really easy to get in and out of and there's lots of internal room to brake and shift.
2. One of the worst things you can do in a fall is try to brace yourself. Better to have your hands stuck than breaking your collarbone.