In all seriousness I don’t know what you’re talking about. My friends and I were just fucking around the other day powersliding as far as we could and I’m never one to toot my own horn but was easily getting a good 10 foot backside powerslide. You could see the marks from some dust in the street. Surely someone less average than us could go much further if they wanted to.
I think honestly they're not easy to control for most, making long ones less useful than fs slides, and therefore less commonly mastered. Since powerslides aren't typically something people do for fun (unless they were born slippy
), I understand why average people can't often do them well... they just don't do them often enough. Long ones on flat are fun but usually skid to a stop or a very slow roll in my experience.
Lots of skaters obviously do sick ones without a second thought (especially GX crew or other hill aficionados). I think I saw some recent Eddie Cernicky footage where he did a nice long one mid hill bomb, and it looked sick.