The secret to be a good instructor is to only talk so that the student hears the words and sees the reaction of the aircraft at the same time. It used to be called "Audio Visual"
The rest is for the pre flight briefing.
Tmb
I think perhaps a difference in languages might be in play here :-)
Keeping the technical stuff on the ground is one of the important factors stressed in what I have posted.
As well, I don't think any good instructor would argue that maximizing the student's time on the controls coupled with verbal guidance from the instructor isn't preferred procedure and good flight instruction.
I would respectfully suggest however that the latter, although good practice, is simply a single factor involved in good flight instruction.
There is MUCH more involved in good flight instruction than this.
The term "audio visual" as used here in the United States refers to structured presentations that utilize both a visual projection like a slide projector or camera, and a screen, coupled with narration.
I'm sure the term perhaps has different meaning outside the United States.
Where are you from?
Dudley Henriques