Having not digged too-too deep into the precipitating question, please allow me to party-crash and give some of my thoughts on *why* Back It Up! is so valuable:
Explaining *how* one knows their answer is good (be it citation to a rulebook or actual play experience or Mike Shea's blog or internal company documents) serves [the long tail of readers](https://meta.stackexchange.com/q/244534/311001) better than not explaining.
Providing the correct answer helps one person. And it may help people down the line with *that exact* same problem.