"Twitter founder Jack Dorsey's advice to entrepreneurs: 'Get out of PowerPoint'' http://www.businessinsider.com/twitter-square-jack-dorsey-advice-to-entrepreneurs-2017-6
"Twitter and Square cofounder Jack Dorsey's main piece of advice to entrepreneurs is don't spend too long dreaming about your idea — get out there and build it."
Mr. Dorsey goes on to say stop modeling and "what ifing" . Create, create and create.
Having been part of, and participated in, and otherwise seen the unending models based on assumptions that can't be possibility quantified without any history or market penetration, I can concur.
At some point you have to just jump in!
What do you think?