The internet slang is full of acronyms. Some are harmless and well known, such as "lol" or "IMHO", but others not so much. Tildes is explicit by design, with a preference for clear text labels instead of icons. In my opinion, that's a great design choice, and maybe we should take inspiration from that in our communications. On Reddit, it's common to find obscure acronyms. Some subs require glossaries to understand their particular lingo. Sometimes this is necessary, but, in excess, acronyms can be annoying and even excluding, especially for non-native speakers. Because there are situations in which the use of acronyms is required, I don't think there should be a rule on the matter. That's merely a suggestion. What you lovely Tilda Swintons™ think about it?