You are absolutely correct about the ambiguity and problematic emojis. The trigger issue was the usage of hearts as “kudos” reactions. That’s where we use the thumbs-up emojis now.

The idea of a reference webpage is a good one, but with Slack allowing you to upload your own emojis (and us using some -- such as the Piccard facepalm and “modern solutions” meme), we’d have to be very careful to show only the default ones.