But I think that's still possible. For example when testing a new idea that just takes some months, it's pointless to show an alpha version where half of the bu

But I think that's still possible. For example when testing a new idea that just takes some months, it's pointless to show an alpha version where half of the buttons create error messages - even if it solves a much more valuable problem and these errors could be ignored. Instead one should make a presentation of a mockup or a screen recording how a single feature will work. That's much more digestible for everybody and gives far better results if the one watching has anyways only 3 minutes time.