Could be the cause for a few ice, but I dont think it is the main reason.
As by far the majority of hydrofoilers come from waveboards around here, where the front foot control and dominance is the very same.
They havent touched a TT board for many many years.
And they, as well as me, noticed the same.
The last couple of years, more and more TT riders are going hydrofoiling though, so this is changing rapidly.
I think it is the progression:
First off most are adviced, correctly, to move the straps forward, or the mast back in the track, so the wing do not pop out of the water.
You learn to ride this way, and when learned and not needed anymore, your body might still remember this even strapless, and only slowly you will go towards a full balance stance, meaning further rear.
Also, when learning, you ride really powered and also erratic in your power from the kite, can come and go suddenly not on purpose.
Most importantly, your body do not have full relaxed control till after a very long time, so having a tad more pressure on your rear foot would mostly lead to you touching down if you release this pressure, no big deal board just touching down instead of a big ventilation crash.
Above means the risk of popping the wing out of the water, leading to disaster, is huge if you were standing fully balanced right from the start when learning.
So standing a bit further forward, pushing a bit more with your rear foot, will work better when a beginner.
I also think some prefer to be able to really push with the rear foot in turns, when experienced, meaning sometimes a wider stance, and at least a further rear stance maybe even more pressure on the front foot is good
Have noticed this myself, if I am carving around hard both ways downwind, or on a wave, I stand a tad further rear for having natural sweet balance during this.
Riding straight sucks, carving rocks