I got where I am today due to luck. I did work hard. But I know other people who work hard too. Who are just as capable. They just didn't get assigned to the class with the really awesome, motivating teacher. Or randomly picked out of the pile by a recruiter for a call. Or happen to wind up working somewhere where they made friends with a guy who was well connected. Etc.
To discount luck's role in how people get successful is a huge blind spot.