Not that much time for such chit chat when on final approach.
Yes, I have picked a number of good tips. But I think it's important, especially for a new PPL to stick with what they've learnt to do so well over countless circuits. There may well be better ways to do certain things but if the new pilot has got it at least 90% right then give him or her the credit for it. Trying to re-train takes away the new pilots confidence in himself/herself and that confidence is very important from a safety perspective. I'm not saying OVER-confident - just confident. Overloading a new pilot with too many confusing ways of doing things is ultimately just going to lead to disaster.
The same is true for students moving from one instructor to another.