No, seriously, ew.

I reject 100% hieroglyphic communication.

⭐As in, you reject communication that is 100% hieroglyphics?

Or you 100% reject the use of hieroglyphics in communication?

I'm aware that the former is a subset of the latter.

, as in, emoticons and emoji are meant to be used like punctuation.

But what if they contain an actual word, like "cool"?

Did you try to use an emoticon to start your sentence and fail? Or was that a typo?

See my previous post on what emoticons are still legal on HN.