Earlier quoted context omitted.
I really like your reasoning. The only problem I see is that if everyone did what you propose, we wouldn't have Hacker News at all (upvotes, in the end, must come from somewhere). So from a Kantian ethical point of view, it doesn't really work. There ought to be a better solution. But on a personal level, I wholeheartedly agree
I take your point. But note that I'm here upvoting and commenting still! I saw the link to this article in my RSS feed, and I took the time to open a browser, find the link, and comment because RSS adoption is something that I genuinely want to have a conversation about. Which means that with RSS, you can still be a part of the community, you just won't reflexively upvote or spend time in the comments section.
Sometimes an uninteresting website has a very interesting article. This is specially great for supper niche stuff. An empty feed should not draw much attention in a reader. The single comment posted years later could be really useful.
There is also https://validator.w3.org/feed/docs/rss2.html#ltcommentsgtSub...