|Why? Because it is more consistent. I know that I would be irritated when feeling sidewards stability while rolling changes to no sidewards stability when hitting the coping. It could be totally different for you, but then, I did do a bit of ramp riding on inlines, too. Just try it out and see how it feels. You always can change your sliding setup later unless you glue or solder it together. That's the charm of using screws: It can easily be dismantled again.