I've just spent the afternoon with a guest debating the merits of proper binding placement. It was an interesting discussion so it may make for an interesting thread too. I'd love to hear other skiers thoughts on this subject!
My guest's opening position was that he didn't need Mikro-Just because he can either tune the ski's behavior by adjusting the fin or simply ski around minor issues like "close enough" binding placement. While I agree with him in the big picture, I sleep better at night with "perfect" than I do with "close enough" (my therapist is helping me with this
My position was that every ski has a fixed and permanent pivot-point that is a function of the widest point on the ski's base, its rocker, and its bevels. This fixed pivot-point is kind of like the fulcrum on a teeter-totter. Where you stand on the ski affects the ski's balance on either side of this fulcrum. If you are too far back, it makes getting the necessary tip pressure for a good turn more work than necessary and can promote space-wasting wheelies exiting off-side turns. If you are too far forward, you get too much tip pressure too easily; you can wash out the tip by overwhelming the surface area ahead of your bindings; and it's hard to smear the tail enough. Also, when you put too much of the front end of the teeter-totter into the water, it levers the tail end of the teeter-totter up towards the surface, exposing it to easier tail blowouts.
Between these opposing issues is a perfect balance for your individual collection of skiing habits. Since the pivot-point is a permanent design element of the ski, it seems logical to first get your unique and personal stance balanced right in the center of the ski's sweet spot, THEN fine tune how the ski behaves within this sweet spot with fin adjustments.
Yes, you can overcome less than perfect fore-aft balance with skiing technique, but for skiers lucky enough to ski a lot, they have deeply engrained habits. Not standing in the perfect spot relative to a new ski's pivot-point forces these skiers to do more or less of something that normally just happens for them automatically. Of course a good skier can do this, but I just think it better to set things up so the skier can spend less time "overcoming" ski handling quirks and more time skiing automatically.
Finally, this pivot-point is a "point" not a "range." Mikro-Just and Velcro let us locate our unique and pre-existing habits exactly where they need to be relative to this point. If your bindings are not exactly where they should be, anything you do with the fin is merely masking this fundamental imbalance--and two compromises never add up to better performance than two perfects.
P.S. My guest just asked me for contact info for @OTF
so he can order a Mikro-Just kit. Ha!