@ericro I was part of start that had "launch first build later" approach. Here 6 years after the MVP still haven't l been fully build, and the CEO is still travelling and trying to get customers into a his vision.
Not speaking about when we did manage raise money, the money were spent of sales and marketing people, while the MVP was still in development. The sales and marketing people outnumbered us 3 to 1. He ran out of funds, people left, and the MVP was half built.
If you have something that is easy to build sure "launch first build later" approach or you want to test in small scale for now, sure, that approach can work. But building the MVP is always going to be the bottleneck, so don't underestimate how effort, money and time it's going to cost. Not just an afterthought. Until you have a functional MVP at hand, the customers that you get to buy into your vision is sand between your hands.