When I say single skin in this context, I meant single skin as an inflated LEI vs a ram air kite. A single skin kite eg Flysurfer Peak would be in the «ram air» camp though technically it is a single skin also.
I wont dig i to why LEI were superior for kitesurfing, I think history speaks for itself. Foils are niche market today. But who knows, if some time in the future foil kiting and snow kiting is the mainstream of kitesurfing, LEI may become the niche kite design.
It all depends on whats best for a particular ise, I guess