I have a similar philosophy, I tended to be a bit more active as a commentor than a poster but if I don't have much to add to a thread then extra comments are just adding noise.
Same boat but really I think it depends on context. A serious discussion or someone looking for specific technical advice on something then I totally agree. Shitposts and silliness serve an important role though, anyone can wade in, it’s a useful ice breaker and for the lurky types who maybe need to build some confidence just posting anything (without being obnoxious) should be encouraged.