Voile Switchback v. Switchback X2?

so if i'm skiing three pin on a charging ski and have the full ball of the T1 on the deck (because my position is solid and stance is tight), then I don't need that spring and heel lever?

.  .  .  because my position is solid and stance is tight.  .  . 

Ah, a fully loaded question 

I'm a big boy and I've never been able to flex my F1 bellows that much in a 3 pin.

An individual's COG, thigh length, shin length and overall flexibility are factors.  That has become apparent as I haved watched various tele techniques the past 30 years.  If your technique and physiology are such that your entire forefoot is loading the ski deck through the entire turn in a passive binding, then you might not notice much benefit from an active binding.  (But, then again, you might, as evinced by a lowrider bud of mine who recently got a rig with HH's and skis demonstrably better on them than on his Targas.)

But someone with different physiology may have an equally "solid and tight" stance and good technique, yet not be able get a T1 bellows to flex sufficiently to get the forefoot on the ski deck.  That person would very likely benefit from an active binding.

Nearly all skiers with T1's and passive bindings appear to me to be skiing the rear ski with their tippy toes.  I came to hate T1 bellows because they were too stiff and switched to T2s and SynerGs.

Ah, a fully loaded question 
..

Yeah, sorry about that. So, it is about loading..?

BTW, my favorite nordic ski patrol (30 days last winter) set up on the MTTA is Karhu Guides (waxless), tlt speed bindings, and tlt5 boots . I'm now using my tele stuff only eastside around Mazama on the MVSTS. I may well get another NNN-BC setup (I have the bindings, but my SNS boots shrunk and I gave them and my SNS-BC boots, bindings, and skis to my stepson).

... T1 bellows because they were too stiff and switched to T2s and SynerGs.

That is why I liked the 1st edition of the 3-buckle T-2s, they were actually easier flexing than the 1st black and later T-3s.  There seemed to be a pathological tele syndrome of bigger boots requiring more active and heavier bindings allowing bigger, heavier skis requiring, then even bigger boots .... .

Of course, this culminate in a reasonably good development: NTN.

Nordic ski patrol on alpine bindings?   Sounds like a great setup.