My specific context for caring is for posting at /r/whatsthatbook. Several years there have convinced me that many people have no idea how to communicate clearly about books, which is a problem when they are trying to find books. I'm reasonably certain that if they struggle to express themselves in a way that will make sense to people who don't already understand what they're saying then they'll also struggle to understand what other people say if it isn't blindingly obvious.

(You have no idea how many people, for example, will give an entire description of a book in English, then say "I hope this is clear, English isn't my first language and I wrote this using google translate", and never tell us what language the book is written in. You'd think that'd be obvious, but apparently not? And that's the tip of the iceberg when it comes to vague or missing details, but oh wow, they're all eager to tell us that this is the book they read when they were stuck in the hospital or whatever.)