@jw The fact that emoji can have alternate meanings (especially that can’t easily be discened from context) is one of the problems that makes them ill-suited for clear communication (words can have this problem, too, but you have more context there, at least to be able to tell “this doesn’t mean what it normally means here” even if you don’t know what it does mean in that situation). Most emoji are pretty clear and distinguishable and I don’t really have any problem with using them, but the emoticon-successors are really problematic for me; we went from 10-20 ASCII or crisp pixel-art emoticons to 75+ smoothed face emoji, many of which vary slightly in ways I can’t discern how they change the meaning. So in an exchange between someone who is familiar with the emoji and their standard meanings and someone who is not, I could pick the wrong face and convey a different meaning to you than I intended, or I could infer the wrong meaning from the face you used because I don’t know what it’s supposed to mean—and that’s without any community-specific meanings.
(For the record, 1) I’m not anti-emoji, I just find the emoticon-successors problematic for all those reasons, and 2) I really like your 💙 empathy heart; in that case, I think it’s ascribing a useful meaning to something that has no inherent meaning, unlike the emoticon-successors.)