This kind of teaching -- don't trim on final -- is what's wrong with much of flying training as it stands today, isn't it? Students taught to fly airliner-type, enormous circuits, often onto strips of tarmac onto which you could land the space shuttle. I learnt to fly like this the first time round at Hurn as it then was and you simply don't get the runway 'picture' fixed in your mind, because you don't have to. You have a mile and a half to land! Let's see much shorter, tighter, lower level circuits into small grass strips being taught to a much more frequent degree.
My advice to aspirant pilots is don't train at massive huge airports if you want to go on and fly little planes. Fine for airliners, but not anything else.
QDM