A “congrats” is not a comment worth paying for.
The default LinkedIn thread is a stack of the same three words. That stack does not pull a post anywhere. It tells a stranger the author bought a chorus. This cart refuses that chorus. If you cannot tell us what the post is about — a hire, a number, a product claim, a take — do not order. We will not invent a professional voice from a blank box.
The useful comment names the claim, adds a fact, or disagrees in a way the author can answer. Everything else is decoration on a feed that already ignores decoration.