I tried to provide a more productive response, but I’m noting for posterity that you got my upvote for succinctly demonstrating the point.

Your comment is being intentionally dismissive of the grandparent's post. The false inference is that everyone who uses the word "just" is intending to be dismissive.

That's what I don't like about articles like this. It tries to establish some kind of universal rule that questions like "Could you just cache the hot partition keys?" are automatically rude, without considering any context. Context matters. A person could ask that question in a well-meaning way, and it could even end up being a helpful suggestion! A person could also ask that question in a dismissive and arrogant way. It depends on the person and the relationship between the speaker and the listener. Intent matters.

The perfect response. Thanks for your comment :)