It's all relevant. When you lose a tryout camp pitcher to a 220 day injury, it doesn't register. When you lose a former 3rd overall pick to a 48 day injury, you feel like you just had a dozen of those last season(which you did but it was to non-prospects). Overall, injuries are far more infrequent in HBD than real life. If you have your training and medical high while making sure pitchers aren't throwing fatigued, you're doing all you can. It's just going to happen.
From my former team, overall #1:
Hardball Dynasty – Fantasy Baseball Sim Games - Player Profile: Jalal Darling Two injuries with 99 health and 20m in training/medical. Drove me insane.