Jorge, you are making a big leap between “Designers can — and should — help teams clarify the product vision upfront” and “Once a clear vision is agreed upon”, especially when you’re also throwing MVP in the mix.
Take a couple of minutes to read this article on MVP-as-a-process:
Now, can you see that the designers may have to step away from having a “product vision upfront” to clarify to the team? The order of the steps that you mention at the end of this article may actually have to be:
- define minimal
- defend minimal
- evolve vison
- evolve product