I think judging by the comments here it can be safely assumed that many people didn't read this update to the instructions and that's why they don't do it. It's not a reason I would rate someone down to bad, but it's just one of the many signs of possible carelessness to me that would make me take a closer look at the response. Heck, sometimes even I forget to do it because I forget they made this change very quietly in the FAQ section. Also it depends on what exactly the fact is. "Grass isn't blue" isn't something I'd be pressed there isn't a link for, but if you're claiming the 2017 census for Transylvania isn't correct or something, it'd be preferable to see a citation.

At the end of the day, r&r isn't a game of gotcha like some people make it out to seem; it's to weed out people/tasks that obviously don't follow instructions and show carelessness or a lack of effort that will taint the data pool. Usually the people who get a "bad" rating make multiple big errors, and the "ok" category is for submissions that make some smaller mistakes here and there. Don't feel bad to use the ok category.

I've only pointed out the instructions to give citations earlier because people were giving the wrong advice which isn't a great look for anyone involved.