I hate URL fights. I give little extra value to people providing links with their clams. I largely given up providing links to information when called out as well. It's not worth the time. Discussion on the internet is broken in most places (HN is less broken than most). I find little value providing URLs. Much of the time I provide them, few folks seem to read it, fewer actually want to read it in an intellectually…
That kind of self-fact checking is enormously useful since i) I look less of a fool and much more importantly ii) Less bullshit is propagated overall.
I'm not sure how you can know that "nobody is really reading [your links]" - on most forums the number of people reading a thread will heavily outnumber the people participating. Who knows how many people are reading your links, perhaps months later?
Even when not in a discussion/debate I think providing a link is just good manners. Searching for something might only take 2-3 minutes but why should every single one of your readers have to do that? Isn't it more efficient that I do it once and provide the link? This is especially true when there are multiple versions/editions of (for example) videos with very similar titles but different quality or subtly different content. A URL helps to say "This is the specific thing I was talking about".