He doesn't play any events
And when he does... He doesn't win them. Bergman always seems to find a way to lose in the final 16 of any big event, which is basically the same sort of pressure as the Mosconi Cup. Corey, Billy, and Skyler (and now Tyler Styer..) have all won majors in the past few years, yeah?
So, the ability to win a race to 100 against another pro means diddly squat. Long races allow lax play, followed by hard play to catch up. In a major event, and the Mosconi, every single shot counts. THAT's what is missing out of Bergman's game.