Not a thing of the past
I agree with the above.
It's good to talk about theory and practice and get updates, reflect. A flight test is good but the seminar does other things. There are in my experience many airline pilots in attendance on these seminars - many not currently instructing and not current on GA types.
It's expensive: the hotel, travel and seminar cost compared to a 1 hour trip in a PA28 and a 1 to 1 with a FIE.