It bugs me when people link to the version derived from the form with the trailing slash after the subreddit name, instead of e.g. https://www.reddit.com/r/news.rss
That one works fine, people, so y u do dis?
Personally I feel like the precedence is more obvious with the slash, so it's clearer to figure out how more obscure combinations work, like:
https://reddit.com/r/news+worldnews/.rss
That being said, I also hate needlessly ugly URLs. If someone leaves in the tracking garbage then I hate it (like this):
?utm_medium=android_app&utm_source=share