Hi Dod and malcolm im new to AT too so please take this as just my opinion. I am not a teacher nor do i have one as yet.
"Could you please explain why Alexander did not think that end-gaining was good?"
you want to pass driving test.(goal) so you take lessons.were you to constantly think about passing driving test (end game) while taking lesson you would not be paying attention to the lesson. nothing "wrong" with the goal,but best to concentrate on lesson now or failure could follow. This is just my view on end game,so comments,corrections most welcome. great to meet you folks.