Everyone I have heard say this has been a pretty bad non versatile bump skiing in my experience., they also unwilling to get rid of diffeciency by spending time doing boring stuff. Video of someone who believes this or has taken a mogul clinic would be most effective way to refute this comment.
you can learn everything but tactics by grooming skiing, Tactics and why we use certain tactics can only be learned by skiing bump and by observing others ski bumps.
again there are ton of for and aft and flexion drills that be entirely done on groomers.
Short Radius Leaper
Hop turn
pivot slip hops
flappers
Butters
Stem Step
Sequential stem step
Dolphin turns
my biggest beef with most suppose clinics bump, big mountain, elect isnt that their information is wrong its that the approach of trying something over again again when their are glaring problem that will never be fixed by skiing the terrain they are over and again. In fact if anything its mostly teaching survival skiing while solidifying bad habits. I would say for true high end experts being able to pick a former pros mind and decipher what will work for yourself can be extremely beneficial for a ton of people who are going to take one thing like say " throw your arms up before big bump" and take it WAY to far, not realizing how extreme of circumstance would require that full body extension prior to hitting a large bump face and how fast you d have to be going.
The reality is if I started a clinic that promised to make the average person better at bump skiing, it would spend as much time on flat boring groomed snow until everyone in it had basic fundamental skills. I know that sounds boring but surprisingly its not when I get large advance expert level groups in my day job.
@KevinF said it well, if you are unable to make a 100+ short radius turns on a blue groomer with out gaining or losing speed there is a not a chance even an easy bump run will be doable. Those turns should be done centered and with no rotary movement from the pelvis up.
Noone would ever sign up for such a clinic even though in the end it would actually lead to better skiing, than just beating your head off a wall as you learn to survive terrain, instead of thriving on it.
once people have fundemental skills learning tactics and why to choose them is he next step. If you are a truly proficient skier learning any new tactics should be stupid easy. If you have even been introduced a new tactic and are unable to do it fairly quickly......my educated guess is its lack of fundemental skill.
lastly any clinic of any sort that preaches ONE tactics for every bump run you come across, is a BS clinic and should be avoid. bump are natural, they are never the same, one single tactic will never be sufficient for learning to ski bumps unless you want to become the person that just complains about oddly shaped bumps when the tactic you have been taught is not working.