To my reading, that post wasn’t very clear, at least not initially. I believe the title was changed in good faith as an attempt to sharpen the discussion on a particular behavior that was being considered buggy. I don’t see a request to keep discussion concise and focused a “snipe”. And, yes, past behavior does color how things are read. If someone regularly uses the word “bug” to talk about a missing feature, then it’s hard to know how they’re using the word in the future.
But here’s the most important thing: neither part of this is contentious on a technical level. Within the first two replies it was acknowledged that, yes, overflow behaviors can be wonky, but it’s a deliberate design choice. And yes, we can make the promotion behaviors more consistent. There’s no need to belabor the point or argue about the severity thereof.