You not only answered your own question, you provided solid data to support your claim. I cannot find any reasoning to dispute your assertion and add my affirmation to eventually turn this knowledge into a universally accepted truth. Perhaps the second law of WAM. The first being that shaving cream is not WAM.
We used silly string, among other things, in an attempt to add some unusual touches to a recent video. The production was so messy generally, the presence of it was neither here nor there.
It's okay as part of the trimmings - but no substitute for the real meat and potatoes.