Because from the moment you show customers a compelling offer, most will only be willing to wait up to two months before moving on to other solutions. If your product takes 6-9 months to build, you’ll have to be prepared to run through your problem discovery sprints again as a lot can change in that time.
The strategy behind the staged rollout mindset is limiting your initial rollout to a small batch of ideal early adopters. If you can’t get 10 ideal early adopters to the finish line, what makes you think you can do that with hundreds or thousands of customers.
When you give yourself permission to scale, you can go faster. You don’t need scalable channels or infrastructure, and can solely focus on racing to deliver value.
The primary directive of all these approaches is the same: deliver customer value first and then optimize the value delivery mechanism.