Why bother? Because in recent years, the trend has been distance over finesse. Some players can partially compensate with new equipment, however since almost every player upgrades, there isn't really a competitive advantage there. Other players need to pump iron to get more muscle, thus hitting it longer. Some players just have long swings, although not classically "fit". Cabrera and Perry are prime examples.
As championship courses push closer and closer to 8,000 yards, there's an impetus more than ever to be stronger. Yes, Tiger did spark this off in the early 2000s, but it's also reinforced by the younger players joining this tour. Mcilroy, Kim, Villegas, Ishikawa, D. Johnson, Quiros, etc, are all exceptionally long. If you're short, you're only competitive at limited # of events.