I agree that the MVP is a journey, and not a one-time validation event, and that continuous iteration is necessary to refine the product into a competitive offering in existing markets.
I found the emphasis on using a waitlist strategically to collect targeted feedback from specific tranches of early adopters a solid recommendation.
Given this, it tracks that when you narrow your target audience, you can be more selective and intentional on how you deploy resources. By leveraging deep understanding of specific user needs, you can create significant value compared with the competition.
Is this similar or different to your approach?
Cleft Notes