On my brand new (2018/19) AX's, I jumped into the stock system bindings positioned for the recommended center-line and found the ski to be perfectly balanced fore/aft.
My guess is that the people recommending that the bindings be shifted forward generally rely on riding the nose of their skis to make them turn, rather producing significant edge angles with ankle tipping, angulation, counter-rotation, upper/lower body separation, etc.
Nope. I think I explained this pretty well in my own posting above, but.....
As one of the folks who enjoy using demos and Schizos with not all but many skis, especially fat ones, it ain't that (what you said).
For example, I enjoy FIS GS 188/30s regularly also, among other, more purely traditional skis - skied at high angles, no problem. ( And I don't move that setting around, once settled on.)
I also enjoy multiple styles of skiing, sometimes on the same run. And I appreciate skis that respond well to multiple styles, especially with non-race skis, even more with fat skis. (For example, not a fan of skis that really want to be skied more upright only. Both forward and upright is better, more fun.)
What I experience is that with moving mount points, distinctly different ski qualities come out with many excellent skis, that are all a lot of fun, all "sweet spots" of some sort. (Some great skis, on the other hand, really prefer one mount setup more.) Oh, and I also enjoy the experimentation and discovery involved in skiing these different settings. It's like having an expanded quiver all in the same ski, no extra charge.
The AX Laser happens to be one ski that really has multiple sweet spots hidden in the same ski, found by simply moving an appropriate binding forward and back - easy with schizos or demos. (And I don't just leave the AX in the same forward position; I like the suggested line also, when I want the ski to feel a certain way. Also, it's fun to play in this way with muliple fore-aft positions with different lengths of the same ski. In this way, multiple lengths can become really fun for the same skier, just with different ride qualities, different favorite uses.
This sort of thing has a subjective element to it, no problem. Other skiers may prefer only one mount point setting with the AX. Or mounting it and forgetting about it. That's all fine too. This stuff we do is because it's a lot of fun, right?