There is no way this is a good faith question. As someone delivering their opinion on the internet - surely you can explain why someone would like to deliver their opinion on the internet.
Obviously I am still on HN so I still do it, but I definitely feel it's futile and it's a guilty pleasure. But even here, I've lurked or posted for many years too and I can't recall anyone changing their opinion on anything.
Even if you haven't changed opinions, you may have helped take down strawmen or aid others in steelmaning.