I've watched a number of demos, and done a few myself (I'm not trying to do anything now, I need more skill building technique).
I think entertainment value is important, you need to hold the audience's attention.
From the beginning, I went to intermediate and advanced demos, I figured the beginning stuff was "self explanatory" (I was VERY WRONG) A well considered and "intuitive" program is important to keep your audience on track, and (IMO) it has to be done in a way that is interesting to the intermediate and advanced turner, but accessible to the beginners... I say this, because as a beginner, I thought I could take in a lot (and I could), but the information didn't transfer to the hands. I understood, but couldn't duplicate and I sometimes put myself at risk. I'm getting better at that.
Till us 😎 "super turners" 🙄 figure out that we are just like everyone else, and need to learn the basics, just like everyone else, I think that basic techniques and SAFETY should be a pronounced part of any skill building demo.
That said, At the first symposium I ever attended - before I had turned anything, Keith Tompkins did a segmenting demo (the first one he ever did, I am told) that had no actual turning in it, but was interesting, amusing, informative, accessible and doable... I STILL have not used the technique for segmenting yet, but his demo lead me to try building a sled of my own design (that works really well for it's purpose) and given me ideas about and methods of examining my own ideas that I will always use.
I'm going back to school myself to insure that I can use and show basic skill and safety, before I try another demo, I want to be as good and as safe as Don Orr and/or Paul Petrie (and a whole lot of the other guys I have learned from in my club).