This is definitely a good example of "RSS culture."
(This particular one isn't papering over flaws in the spec, many of thse are advising against doing things that violate either RSS or XML spec, or are subjective opinions additive to the spec (e.g. always have a datetime). But ya this is basically what I mean.)
Back in 2013 a developer of a feed crawler wrote a selection of things people get wrong with their feeds.
https://inessential.com/2013/03/18/brians_stupid_feed_tricks