I think that rule re: touch and goes at night could be applied to any unfamiliar (particularly shortish) strip. Whatever benefit it is imagined circuits during a training Nav might provide, you could be in for a rude shock when you discover how big the gap between published and actual TODR can be in whatever decrepit rust bucket you are in, especially allowing for the standard of technique of your average Ppl trainee.
What my concern is is that students are taught to fill in p charts and then conduct procedures for which they are of little relevance, and I wonder if any rigor is applied in assessing field suitability for touch and go circuits.