You can't rely on intuition and UX best practices. The truth is that no matter how good you are and how well you (think you) know your customers, most of your "best ideas" aren't.
Minimum Viable Products sound like the enemy of good design. But they don't have to be! By embracing "MVP thinking", designers have a powerful tool for gaining credibility, aligning with your org's business goals, and -- most importantly -- becoming a more effective designer.