Similarly, with Github Discussions, each emoji has a distinct meaning and can convey the topic with many less pixels. Ex, I can use a as a replacement for "Feature request", as a replacement for "Bug/Issue", and for "Vulnerability".
Now if you start shoving them as the only way to communicate something, there's your problem.
Also, there's an issue sometimes whereby people who have nothing worthwhile to say thing that adding a few emoji will now make their message worthwhile...
Imagine that this comment were my only contribution to this message thread. Imagine that ten other people commented the same because the community was very engaged. Now, imagine that pattern of commenting across every discussion.
Would an emoticon have been better?