Not only neurodivergent people need the "/s". Not all subtle speech cues are easily transmitted through text.

And it is not even only neurodivergent people where /s is helpful. You dont hear the tone of voice of people in the internet which is used to indicate sarcasm irl. I would rather use an /s than people misunderstanding what I wrote abd maybe them thinking I am some kind of conspiracy idiot

I’m a neurodivergent person, and I love sarcasm because I’m not a stupid neurodivergent person.