Firearms Training and Practice - Focusing on skills, not gear.

[Boney]

I was taught in a class the value of having a co-witnessed front sight is still a useful aid driving the optic dot on target as you draw and present.

I suspect I'm reading to much into the way you are wording this, but I'm going to jump on the opportunity to emphasis that in no way should you be "transitioning to your dot".

A red dot should overlay the target in your focus. As in, target is clear in your sight picture, a red dot or even just the smear of it is where you want on the target. I think you are describing an effective (and new to me, good post btw) method of making sure you have consistent index and a way to guide yourself onto having the dot on target by using that front sight post as an index point.

I will also say that its probably not the end game for dot use. As in, I don't see the best shooters doing this in any setting, be it operators, larpers, or competition shooters, they all use a tall riser and dot in order to get optimal posture shooting. Lower 1/3 like you mention at least, or more often a 1.93" and micro dot or EXPS-3.