Yeah, I've definitely found that nobody reads more than maybe 10 words of the PR description.

I've also never seen anybody but myself write substantial PR descriptions at my previous 4-5 jobs

But if nobody writes them, they don't have the habit of reading them either.

However, also make sure your PR descriptions are not "substantial" in the "there is a lot of it" sense, but only "substantial" in the "everything of substance is described, but not more" sense :)