Many individuals don't like startups because of this risk, most startup only get 1-2 chances to get productivity right. Very few waste time measuring productivity.
If they don't get productivity right from the get-go, they only get 1 chance instead of the "1-2 chances".
That's the risk most individuals don't like about startups, if productivity is not a centerpiece of their operation, the leadership pushes for the only other solution they believe: long hours in inhumane working conditions.
I don't believe there's causation between a start-up productivity and their product success, but I would love to be proven wrong.
It's just a rant from someone that thinks they're too good to be managed, probably that kind of engineer that has 10 conflicts a week with everyone in the company because they won't budge on their unfounded personal opinions.