Seriously? Complaints about overwaxed ledges are not unique to slap at all. I remember a trick tip with Justin Strubing for blunt slides in some magazine where he specifically says not to learn them on some overwaxed plastic ledge or anything like that, because those are bullshit, and you need to make your wheels screech to do a legit blunt slide.
People are picky on here about a lot in some ridiculous ways- in the Micky Papa thrasher part thread somebody complains that he knows every trick, but the idea of putting just enough wax to make it possible to slide, and not enough that you'll slide on your shoes if you jump off of your board has always been something that people have respected