I teach PFL's before first solo. That's it. I don't teach exercise 15,18B,19 etc.
And I make sure the student has some idea as to what to do if things start to go wrong at the airfield. And being a "mixed traffic environment" airfield they do more then occasionally in my limited experience. So far this year I have witnessed the runway blocked for at least an hour by a 757, a King Air and a 152. And all on days that were "soloable".