Surveys are a good pulse check but I think a lot of people think survey and then immediately jump to the conclusion that their response to the survey is part of a democratic process where if they can convince enough people to agree with their perspective that whatever option they prefer will be put into action. I think that's why Blizzard doesn't use them much because of the community's tendency to hang on everything they say as unspoken promises of things they never said. I mentioned this in the first page of this thread but a good recent example is the Morgan Day interview about the new systems in 9.2. Players took his pre-9.2 interview to mean that they wouldn't have to do anything in 9.2 to get double Legendaries. When it eventually got datamined that double Legendaries were behind a reputation, players immediately jumped into attack mode and blamed Day for "duping" people into believing something that didn't happen. I saw people posting death threats to Blizzard devs on Twitter because of this misunderstanding. This isn't the first and almost definitely won't be the last time this has happened but I can understand why the devs would be cautious to speak to a community that almost universally resorts to the most extreme reaction possible whenever anything isn't exactly the way they thought it should be.