This is not a phone app. Physical demos that propose something that a user has no point of comparison with (new paradigm) absolutely need to be on either end of the maturity scale.
- Either very raw barebone MPVs that should be only for lab/research aware people who won't cling to details and are able to see the 'principle' of what it could be.
- Or absolutely imaculate picture perfect marketing demos that you can show to non-technical people
Anything in between is a recipe for getting shot down, getting no buy-in, and receiving no insightful feedback.