Because it's the thing you have to do to be professionally respected these days. And respect is won not by the customers, but by your peers. Having 10 colleagues think you're good is more important than 300k customers thinking your product solves their problems. It's backwards, but understandable because the tech people think normal users don't know what's important because they don't understand tech. But that's also backwards because tech is there to be used by the people for something useful.