Aside from using them in reactions during discussions with group that I know (Discord, Chat/Hangouts), they're too fuzzy in definition to be useful in conversations. When reading on Lemmy if I run into emoticons, I just skip over them as noise in the stream. I don't even try to figure out what the person is trying to convey since I'm not going to be able to track whatever the latest trends are in their meaning. It's the same reason you don't spam a public forum like this with youth slang if you want to communicate with a wide demographic of members.
As a cat owner, can confirm cats are always bad. The best bad decisions I've made, are my two little fuzz balls. And I hope they're happy with me as well.
They are the reason we don't have a Christmas tree anymore.