If…
“A minimum viable product (MVP) is a version of a product with just enough features to be usable by early customers who can then provide feedback for future product development.” - Wiki
Then…
A minimum viable sketch (MVS) is the simplest sketch you can make to get the stakeholder feedback you need.
An over-labored sketch isn’t just an excess of time & effort, but can also distract your stakeholder and therefore detract from the quality of their feedback.
Thoughts?