alt Hacker NewsI'm not convinced it blows up. It might also end up placing a larger burden on contributors, and especially first-time contributors, to provide concise, high-quality documentation that justifies their contribution.
I'm thinking of something like: Explain, in at most 300 characters, why we should merge your change, or at least why we should invest the time to read a longer explanation (somethings things ARE complex). If you don't do that, or those 300 characters aren't convincing, or have nothing to do with your change or the longer explanation, then you get a canned response so the maintainers waste minimal time.
That doesn't really solve the problem. I've gotten PRs that do do an adequate job of explaining why why something should be implemented. Then I look at the code and it doesn't fully solve the problem, or it does so in a way that will obviously break something else.