So now outside of the first round the baseball draft is mostly "luck"? Just when you think you've heard it all...
No, it's a product of good scouting/organizational philosophy and shrewd maneuvering around the bonus pool. Corbin Burnes wasn't a Cy Young pitcher when the Brewers' drafted him, but he fit a profile (namely high velocity and spin rate) that this organization has prioritized since the Melvin to Stearns turnover. And then they DEVELOPED that profile into a Cy Young winner. On the opposite end, you have organizations like the Angels and Cardinals (on the pitching side) who have targeted their pitchers and had it blown up in their faces for the most part.
Sure, there's luck involved, particularly health, but that is far, far from the entire story.