err, I mean. I have not! What's that?
It's great how we can all make our own decisions when communicating, and can ignore judgement from people who say that they are "necessary". You're treating fragmede like they brought up "/s" as some sort of virtue signaling, when they were pushing back on porcoda for attempting to impose controversial new-age grammar.
Not all people in all situations will read a thing as sarcastic — e.g. your response to a post might be sarcastic, but the three comments next to it which were not there when you wrote it, might produce a context in which it would be read as serious by most people without neither you or your readers being at fault. But you have the power to clarify and at least on this platform a unneeded /s has more benefits than disadvantages IMO.
This is what satire is.