People saying it is useless are useful, however, because you can see why it is useless to them and either accept it isn't part of your target market or change the product to include them. People just saying great things when they aren't allowed to be negative is kind of meaningless and unhelpful.
> People saying it is useless are useful, however, because you can see why it is useless to them
No, people saying why it is useless (which is grounded, not gratuitous, negativity at worst) are useful for that reason. People merely saying that it is useless are not useful.
> People just saying great things when they aren't allowed to be negative is kind of meaningless and unhelpful.
A community guideline against gratuitous negativity cannot reasonably be expected to result in "people saying great things when they aren't allowed to be negative" because people are still allowed to be negative, and, in any case, people saying positive things with explanations are just as useful as people saying negative things with explanations.