Follow this strategy to a spectacular fail. We've all seen the startup kids who invest 2 years+ of their life into a startup they really believe in, THEN they release. and it flops.

Your belief in your startup is useless, other than as a way of keeping you motivated until you ship.

This is why MVP and pivot and "throw-jello-at-the-wall-and-see-which-sticks" exist as better, adaptive, strategies.