Part of the type rating course in any company that respects itself.
That may well be the case for some operators.
However, my observation has been that the emphasis in endorsement training usually is USING the sheet correctly as it is designed but not necessarily understanding what goes into it so that it can be used in a non-standard manner to get a result needed for a non-standard situation ...
I won't get into discussing some of the weird and wonderful suggestions which I have observed very experienced folk offer in respect to how this or that bit of the trimsheet is supposed to work ..