WRONG !
A cocoon harness must be stable, otherwise you’d have your feet wiggling. That wouldn’t be good for aerodynamics at all!
A cocoon harness is at least as stable as a classic harness.
There is really no longer any reason to open his belly so that he can waddle better to manage to complete turns. Modern paragliders are very handy! A ventral too open is even counterproductive!
ADVICE
It is necessary to respect the spacing of the ventral strap.
Given the place that the loops take and the anti-forgetting system, it is often tightened almost completely!
There is only the fact of having to catch the foot plate that requires a little habit, which can trouble beginners.
After a few flights already, we can’t do without a cocoon.
