bottle caps in France are designed to stay on, in Canada the bottle caps fall off and pollute the Ocean's
As someone with hand motor problems, I can tell you it's a non-insignificant setback for me. And I'm not the only one.
I don't mind the cap being captive. Actually, it's even kind of handy when trying to take a swig from a bottle one-handed while riding my bike.
The problem is, the retainer creates friction when unscrewing the cap.