If you think the comment is useless and doesn’t contribute to the conversation, downvote it (and flag it if it is particularly egregious). That’s why those features exist.
But complaining that HN is becoming Reddit is (as demonstrated by the links) a tired, repetitive, and incorrect complaint that creates noise and does not advance the discussion. Which is why the guidelines ask you to not do it.
From the guidelines¹:
> Please don't post comments saying that HN is turning into Reddit. It's a² semi³-noob⁴ illusion⁵, as⁶ old⁷ as⁸ the⁹ hills¹⁰.
¹ https://news.ycombinator.com/newsguidelines.html
² https://news.ycombinator.com/item?id=1524184
³ https://news.ycombinator.com/item?id=926703
⁴ https://news.ycombinator.com/item?id=582513
⁵ https://news.ycombinator.com/item?id=582513
⁶ https://news.ycombinator.com/item?id=289254
⁷ https://news.ycombinator.com/item?id=253657
⁸ https://news.ycombinator.com/item?id=66057
⁹ https://news.ycombinator.com/item?id=60767
¹⁰ https://news.ycombinator.com/item?id=13852