Look, eleeski, this is clearly more about your own discovery process. So go to Backcountry Magazine's website or finding a copy of their fall gear reviews. They post weights. Or Wildsnow's website. There are a ton of light skis out there, and more, not fewer, in the works. Not just indies, but mainstream companies: Volkl, Atomic, Black Diamond, K2, Kastle, and starting next year Blizzard all make wider skis under 8 lbs a pair that are aimed at AT but do fine for skiers who value the sort of skiing and terrain you do. And a number of larger indies, like PM Gear, Prior, and ON3P are making high carbon content lightweight versions of their normal weight fatter skis. You already know about DPS. You may not realize that several brands are now utilizing basalt, which is way lighter than fiberglass plus resin, touch heavier than carbon fiber (2.6 vs. 1.8 g/cm3), better tensile strength than either, and far superior at absorbing shock than either. Also far cheaper than carbon.
So where's the problem outside of your own experience walking to the lifts? it's not about choice, because choice is out there, and it's not about some conspiracy to dupe god-fearing American skiers into heavy slug skis, because most companies are smart enough to detect changes in the market long before you or I, and they'll make skis out of balsa wood and styrofoam if people will buy them. Let's see who buys basalt skis like the Shogun made for several years by Salomon and now skis like the Outland series by Dynastar.
Face it, this is about whether the average groomer skier wants super light skis, cuz otherwise there's no incentive for stores to carry them. I've actually talked to several owners this month about this, just curious, and the answer was a flat, consistent "no demand." A good store will carry one or two lighter weight models if there's any market for AT. Some small bodied female skiers apparently also seek really light skis. Otherwise it's just dusty inventory. Most places don't carry Goode, for instance, because Goode skis have truly sucked in the past, and no one wants them now, even if they're better. Increasingly places that serve powder skiers are stocking DPS because they're significantly better, but I don't know too many people who have reported that DPS skis are money on hardpack. Intermediate to advanced skiers do not want to choose between getting jolted by irregular groomer surfaces or learning to dance and toss. (And how many expert skiers in fact would fit your style of lotsa turns and fear of speed, realistically?) The market want right now is for rocker, which if you think about it, takes care of most of the issues you raise. Planes sooner, turns easier, less effort. No need to sacrifice stability on the alter of lightness.