Competitors and instructors argued just as vociferously in favor of the finger on the front of the trigger guard grip years ago. That's why we have squared off trigger guards with checkering on the front that serves no useful purpose, because NOBODY uses that grip anymore. The one above is just the new grip du jour. There are a couple of disturbing things in his video: the first view of his grip in rapid fire shows his weak hand fingers covering and invading the trigger guard. Then he says if he could he would hold the gun by the back of the slide, which could give beginners the impression that they should grip so high that they interfere with the slide (ouch!).
When the adrenalin is pumping, do you seriously want to put you weak hand / thumb right on top of the gun's slide and controls in a gun fight? Better hope you don't drop your magazine or lock your weapon open, or have your safety / decocker fighting your trigger finger.
The push / pull of a modified Weaver grip (somewhere between the "cup and saucer" and the Weaver) allows stress to work for you, without putting your weak hand in position to accidentally futz with the controls or drop a magazine.
Whatever your grip choice, practice makes permanent. I just wouldn't want to use a grip that puts you in a position to accidentally disable the gun in a fight.
I have never had an issue with a thumbs forward grip causing issues or malfunctions... I just get better control of the gun.
I have medium sized hands with long fingers and can't figure out how my grip could cause the issues you describe aside from allowing my thumb to ride the slide stop lever which is easily avoided with practice.
If you legitimately experience those issues (as opposed to just arguing their possibility) then perhaps it comes down to details... your thumbs forward grip needs to be tweaked or maybe just practiced more or maybe you have a gun that does not suit your hands. I would say that choosing a demonstrably less effective grip should not be considered a solution... especially if this is just a theoretical problem you are wrestling with.
Now, granted, anything pertaining to physiology is subject to personal adaptation so the
exact grip that works for one person may not work
exactly for another but the core principles of a good grip (i.e. one that allows you to effectively control recoil by leveraging biomechanics and physics rather than brute strength) remain unchanged. And, again, let me stress the need to practice... especially dry fire with drawing from the holster... a LOT. You will react under stress as you have trained, not as you've thought ;-)
Oh, and Jerry Miculek does still advocate using a finger at the front of the trigger guard under some circumstances, particularly with smaller guns... and he is not dogmatic about thumb placement - his stance is that thumbs
can be leveraged to aid your grip with practice but aren't what really makes the grip. Good grip technique depends mainly on proper hand placement on the gun and (left hand) grip strength... and, as his results show, proof is in the recoil control, shot to shot recovery and pattern on target.
https://www.youtube.com/watch?v=ChSazF41q-s