The purpose is to get some kind of signal that you're on the right track. Many times I've seen would be founders just go off of a hunch without a buy in from a

The purpose is to get some kind of signal that you're on the right track. Many times I've seen would be founders just go off of a hunch without a buy in from any possible users of any degree. Even their voluntary email sign up is far more of a sign than what the founders know users want.