Some things I disagree with while others I agree.
I think the weight would effectively balance out a scooter more. Also, if weight is a problem, remember you're riding a scooter, which is almost the same as a bike, just lighter. A scooter won't weight more than a BMX bike, and if you think a scooter is too heavy, go try your scooter tricks on a bike and come back and try to tell me your scooter is too heavy with a straight face.
I agree about the starnut thing you mentioned. I thought that the starnut would become incorporated where the top cap lip is, and be like inverted compression is, with the bolt.
I disagree with it being complicated. It IS a BMX stem, just adjusted to work on a stem. Take the bar clamping part, turn it 90 degrees and place it over the top cap, widen it, and you have SCS. People think its over complicated because most kids on this website can't put time into figuring something out or use some common sense.
Adjusting the bar height to accommodate for it is easy. I'll explain it in 1 sentence:
CUT OFF THE FUCKKING SLITS
It's not hard to understand. If you're ordering bars from the SR store order them in SCS size that you ride, they come without slits at the ridable size you need. 20" SCS bars will measure 18" to compensate for the 2 inches of rise you get from the SCS. If you have to, order big, so you can cut them smaller.
Those are my thoughts.
Edited for spelling, its 1AM and I forgot what those red lines were for.