I think you have said before that I 'butt in' to 'conversations' that are not directed to me, and I can't deny that, but, if i may just say something here.

Hands-on demo may be necessary to bring validity to the theoretical "talk", who knows? I know from experience in other areas of preparation that hands-on demos are essential to the 'instruction'.

My concern with your 'discussion is over' claim of no added value is that there is not enough evidence to make that statement of fact.

I have my doubts that you or anyone can be so sure of this. And I have my own experience to allow for the probability that what you say is not true, at least to some extent.