I won't lie, I think a lot of people interested in this like the fully transparent look and want alternatives to the (slightly scuffed) Water Kings, plus tactile options. Gonna have to agree with treeleaf on this one: the pic is a bit misleading. The video thumbnail also uses the fully transparent switch, which kinda hypes up the transparent appearance.
Full transparency is the biggest draw to full polycarbonate, IMO. I think an opaque stem would be a missed opportunity. If you would have trouble telling them apart, maybe coloured transparent stems would be better?