People can demo whatever they like.
At the same time, I was suggesting that we need to keep in mind the meaningfulness of what is being demo'ed. Doing bike riding motions in the air (forms) doesn't demonstrate anything other than you can do bike riding motions in the air (forms). Riding around with a bike on training wheels (chi sao) doesn't demo anything other that you can ride around on a bike with training wheels on (do chi sao).