In reply to mark k..

To be clear: This is not about user feedback, it's about collecting hard user data. We are not asking people what they think something should look like or whether one thing is better than another. Instead we are gathering passive data on how they actually use the current solutions. This cuts through the noise of "in my opinion user interfaces with rounded corners are easier to use" to find things like "nobody ever uses this feature we spent 6 months developing." User opinionating about features is done in the qualitative user testing stage. This is what we do now. What we lack is quantitative user testing to show how people interact with the application.