>because you added a non-substantial comment when a click on the "upvote" button would have been sufficient.

I did click on the upvote button. But, since no-one else, apart from the original commenter, can see how many upvotes his/her comment gets, how does that help back up someone's suggestion?

I wouldn't normally post a simple "me too" or "+1" but, in this case, the original poster was asking for a recommendation. So I think, in these circumstances, it's justified [and less messy] to give a 'me too' to a suggestion you agree with, rather than [as many others have done] post a separate reply, recommending the same site.

  >...it makes for boring discussion and just adds noise.

Yeah, we definitely don't want any noise here.

Scrolls though dozens of repeat submissions of the same story every day, hundreds of submissions of tweets as news stories, endless spammy posts for 'keto gummies' and the regular moronic opinions of Evon-fucking-Latrail [whoever the fuck he is!]