A hypothetical scenario: A pilot owns/normally flies a taildragger is out of recency. Has a mate who used to fly taildraggers a couple of years ago, now flies and is current on PA 28.
Does the mate qualify as PIC capable or does the differences sign off lapse?
Would it be a good idea?
Point two: What if the pilot uses a technique that the Pax pilot thinks is dangerous and decides to take over? Side slip fr instance.