Ask HN: The experts told us soft-launch == app death. Does it?

We have worked long and hard developing our mobile app. We think that it's great and has true value for users. We had planned to soft-launch and make it better as we learn from users. But every single app expert we had talked to has told us our success will be as good as the amount of noise we make when we launch. Death, they say, is a place in the long tail of the app store. What say you?