Used correctly the rudder is a very good vertical speedbrake rather than telling you off the instructor should be teaching the correct way to side slip
Are you seriously advocating a slide slip in an EFATO, in an SEP??? In a turn back.?
Please tell me I have mis interpreted this.
You've misinterpreted it
They were talking about side slipping during a PFL to lose height.
I echo what BackPacker said about not enough EFATO training in the PPL syllabus, at least when compared to my GPL training.