Philosophically speaking, the proposition that existence precedes essence is a central claim of the existentialism branch of philosophy. This view takes an opposing view to the general philosophical outlook that the esence or nature of a thing is more fundamental than its existence. Jean-Paul Sartre lived by the phrase that existence precedes essence - we first and foremost must exist and only then do we determine values of existence.
This phrase is just as well with projects and start-ups and is congruent with iterative strategy of many start-ups; push your MVP out there and then you change and update it as time goes on rather than waiting for it to become optimal before launching.
This subject has been covered numerous times by other people, but consider this a refresher that fundamental life and consciousness follows the same pattern of bare existence before perfection as most start-up strategies.