Replying to Bootfitter Questions

Hello everyone, I'm considering going to a bootfitter for my next pair of boots because everyone always raves about them and how a properly fitted boot is 100x better than a "park" boot. Anyways my questions I have for you is will a "normal" boot absorb landings just as well as say full tilt, spks, or dalbellos, or any other boot advertised to absorb shock? Also, I really love the 6 flex of my FT Classics this year, what if I was fitted into a boot that was too stiff or to soft? They can't really change that can they? Do I just ask for a boot with relatively the same flex? All help is much appreciated!