The trick is not to let them wander with the attitudes even in transition periods they should be holding a attitude and not just letting the nose pick its own.
Of course. This I think is where the OP has a point about muscle memory.
On the occasions I've flown gliders I've found most BGC instructors teach flying the last part of the approach 'out-of-trim'; this feels unnatural to me (as does speeding up for the approach!) & if I don't retrim I really have to concentrate to prevent the airspeed bleeding off on short final
Well, this ITP doesn't teach approach out of trim. But the approach speed is usually higher than thermalling speed.
All done and practised away from the circuit. The only thing you should be teaching in the circuit is the last 10 ft.
Halleleuja!
Absolutely!
For the OP neglectable means you can forget about it, it isn't important. Negligeable means it is small, which is not the same as not important.
On a go around the out of trim forces can be large.....so you do need to be able to hold an attitude despite the best or worst efforts of the aircraft.
Type specific comes in here. Rallye, super cub, spring to mind.
Interesting thread which links to the question of things we could teach better