I find it hard to believe that you are serious in believing that a dry sombre approach would be effective in the esl classroom.

If I tried the methods you mentioned in one of the classrooms of the private Middle School where I teach my students would ALL full asleep very quickly.

Even most adult students would find your approach very tedious!

In my school the students start class,which they have seven days a week, at 6.45am and finish at 8.15pm.
Many of them are not even interested in learning English in the first place!

On top of that they're CHILDREN,many of whom have the attention span of a wall(Have you ever tried to talk to a wall?).I think many esl teachers know what I mean!
A lively animated and stimulating approach coupled with a bit of charisma,can often inspire the least motivated of students.

The postings of scores of teachers ,talking about how difficult it is to hold students attention for more than five minutes bears witness to how important our approach and presentation is when teaching esl.

I can't for the life of me see how a dry,sombre,unadorned monotone is going to do anything but drive them further into slumber.

Surely your approach epitomizes how NOT to do it!