I think what he means is, every rail in the park is different and even slides a little differently. It gets comfortable Seshing your pvc rail countless times learning all kinds of 2 on swap combo variations and shit, but then taking those skills to park rails sometimes feels like you're relearning everything.... at least that's how it was with me.
Don't get me wrong summer setups help a shit ton especially with 2's on, getting the timing of the pop and spin just right. I will certainly be using mine again this summer.