Replying to Park skiing without park boots a big deal?

Went to a local ski store. He ordered the HEAD Cube 3 13 boots and began costumizing it to my feet, meanwhile a couple of costumizations has been done, like stretching the shell, adding implants on top of the liners, basicly making it fit wider and flatter. (I went there a couple of times alread.)

The first time I went there I asked for a shoe with a flex around 90, and the cube's got that, what is kind of parky. But it isnt classified as flex so thats a good thing. But it's not classified as a park boot and doesn't have all the other specific park boot features like shock absorbers. The question is, will it suck for me hitting the big kickers in these normal ski boots without shock absorbers, etc? Have you experienced park skiing in normal boots and park boots, and did it make a big difference for you? Did the guys in the early 2000 have park specific boots or did those pros also had to pull all those big airs with normal ski boots?

cheers