Let me try to clarify UL's post with some additional info.
UL helped me realize that my previous post wasn't fully complete in describing the situation where I encounter most skiers using up moves. Most skiers who use an up move couple it with active rotary/pivoting that only will get you into trouble when your skis are being used in 3D conditions - crud, heavy powder, etc. - anything with enough depth and consistency as to make pivoting a ski nearly impossible. They perform their up move at the turn apex and then when their skis are "light" they pivot through the top of the turn followed by a hard edge set and then their next up move. That style of skiing fails for most off-piste conditions and we've all seen those skiers really struggling to get down the mountain when the conditions are challenging.
What UL demonstrated was that an up move can indeed be combined with tipping/angulation/inclination without pivoting on an ungroomed slope. It should be noted though that the ungroomed slope today only had about an inch of wind blown snow on it and was a fairly stable platform. So it is possible to combine some good technique elements with an up move and produce a workable turn (UL skied it fairly smoothly and was not actively pivoting his skis). I would like to see some additional examples of skiing with an up move on more difficult snow.
So back to my point of contention - if flexing to release or full on retraction turns can be used everywhere at any time in any condition why bother ingraining a completely opposite movement pattern into your skiing? And it is completely opposite. I find the it makes skiing "boring" argument ludicrous.
< some direct responses >
@Jamt - in my book jump turns are not about up moves and are a fairly niche type of particular skill only required .1% of the time. Not really applicable to this discussion in my mind.
@tdk6 - I disagree that there is any similarity between an up move and the use of the ski pressure in an arc as a platform. If you want to look at it that way then fine, but admit that it's a much more efficient and reliable platform to have. A ski that is arc'ing against the snow is a given in a good ski turn, but I'm not using it as a platform to push off of before flexing/retracting. Flexing is a passive release of the pressure that has built through the turn while retraction is a move active pulling up of the feet. Both can be performed without any platform or previous turn energy.
@BWPA - For skiing professionals who find it "fun" to learn 8 million different ways to turn a ski then more power to you. I'm a recreational skier and I don't get near the days on snow you guys do (and I probably get over double than most typical rec skiers). Personally I don't want to have 20 knives to cut the food when there's one that does a great job for just about any food.
@nolo - I believe that flexing or retraction is the "perfect transition" for all situations. I'm interested in seeing some example situations (turning situations) where you believe that the better choice is the use of the up move. That's really my point in posting into this thread. I have yet to be convinced that there are times where I would prefer an up move for my release. I want to be the best skier I can be, but I have to do that within my own limitations and skiing opportunities. So don't sue me if I'm removing the up move from my repertoire. I'm looking for someone to convince me that I need to have this in my skill set. Currently I'm working hard to permanently remove it so that it doesn't sneak out at a bad time and get me in trouble.
@tog - we're having terminology communication breakdown. The way you are interpreting what I have written and they way I'm reading what you have written are clearly from two different worlds. I'm sure if we got together and skied a bit we'd get it all figured out.