Wingo Wango
You have not understood how flying time is recorded in the aircraft log books and charged to the student if you can't see why this is about money, go back, read my first post on the subject and try to understand that he company is £££££ ahead from this move.
If this T&G ban is by the outfit that I suspect then 30 years of watching the GA business strongly sugests that money is the only motivation that the company has, they constantly been the masters of the hidden charge and restrictive rule to squeeze the last drop of money from the student.
Of course I could be wrong but I would guess that some minor inccident had been grabbed with both hands as a way of increasing income at the student pilots expence.
The T&G has been at the heart of pilot trainning since avation started so why all of a sudden has it become unsafe?
I would like to think that I have misjudged the situation but only time will tell.