> Reality is messy, there are trade-offs, and a lot of smart people think very hard about what the correct trade-offs should be given a particular situation.

This is great and all, but misses the point. If you have made a decision to cut a feature then at least explain why. This then circumvents the 'why don’t you just' mentality. That is the root of the issue in the examples provided. It would be trivial to drop a warning about the comments not being formatted and include a link to the issue. Then there is no question of 'why' and thus you're now heading off the 'It is a completely trivial feature!' attitude, and blog posts complaining about it. Communicate clearly.