Great founders share one habit: a weekly call with customers. Not chitchat—pain points, value checks, raw truth. Those calls compound, and they show up at the moments that matter most in fundraising. While investors are still flipping through your deck, the best founders have already brought a customer into the room and let the market speak for itself. One phone call beats 50 pages of slides. Because real closes come from customers, not from founders. In 2026, when AI makes e