​Did you mean to write "provoke"​ instead of "prevent"? If we can learn one thing from Twitter it's that such limit favors short and brutish comments over the more nuanced and thoughtful ones - that take way more character space of course.

I don't get what all this fuss is about about comments on PyPI. Such feature seems unnecessary. There are plenty of ways to assess how well maintained a package is. If a package maintainer wants comments or feedback there's the url/long_description fields.