I have a friend who just could not learn to fly his trainer. I put the buddy cord on my "Bingo" took him up three mistakes high and turned it over to him, he flew most of the tank out until I took over for the landing did not have to save him once.
I have no doubt that's all true, but.....
.. for the sake of the bank balance of beginners reading this thread, and the more experienced pilots sharing the runway with the beginners, a 'trainer' is still something to train on, and a more advanced aircraft is for, umm, more advanced pilots.
David C.