In my OP I very deliberately stuck to abstracts that I'd hoped "nobody could disagree with".
And nobody seemed to - until I put more words beneath it.
You're right though - engaging with your own posts is perceived as negative. People read the platitude and hit 'like' - the more you put beneath it, the greater the opportunity for something to annoy somebody (and scroll up to try to kill the thread)
It could be just a reflexive thing to seeing a given username show up too often. I wouldn’t presume it was any deeper than that.