Well written Chimbu....
I thought I was the only one....... You need a Dip Ed (2 years study minimum) to teach school kids but ****** all to teach people the sciences (physics / aerodynamics, human factors, met, etc ) for a professional career in aviation.
I've seen and experienced the instructors whose knowledge of the CASA theory syllabus stops at regurgitating Trevor Thom page numbers. That old "Why and How?" always had them stumped!
One day (hopefully but not likely it seems) a broom will be put through the system and an instructor rating will be a career for those who genuinly want it. Not those who just want hours at the students' expense for the next progression.
If anything raise the bar, don't lower it!!