Salt is such a flavour weapon. People sometimes speak proudly of not using it in their cooking. Essentially they are saying “I have cooked this meal without added flavour”
Who would want that? Maybe in the name of health they are thinking salt is bad. But when you are eating a whole food type diet low on the processed food salt like most things in moderation is necessary. Sea salt is also a great choice.
So salt brings out the taste of the caramel and in this situation also brings out the cacao and popcorn. So why not?