Agreed. I think this is a circumstantial point. I suggest that if you have a much more intimate understanding of your customers - AND - enough self-awareness

Agreed. I think this is a circumstantial point. I suggest that if you have a much more intimate understanding of your customers - AND - enough self-awareness to be objective in determining what they need vs. what is nice-to-have ... then you can go further. Maybe the rule should be: launch as soon as you have something that will provide value to someone, i.e. MVP in the technical sense of the term.