That's assuming the cofounder/s are not dictators. More common issue than you think. Ego issue of Power. Hence why I dislike titles (labels) when one is a small team.
Market fit should be worked out ahead of the team by the cofounders. The great team will contribute to it and over time everything evolves. Should the market shift fruit when you have the team, team transparency will help everyone steer the ship in a different direction. Otherwise the company will run out of cash chasing the founders fixed mindset.