> they need to recognize the role that luck played into their original product and design.

That's a strong lesson I've learned in life. Successful people _rarely_ know the precise reasons that they are successful, almost exactly for this reason.

You may be aware of many of the components of your success, but you won't be aware of all of them and it will be impossible for you to rank their importance correctly.

Keep this in mind when successful people talk about their success and offer suggestions on how to replicate it.