Is forecasting wrecking good selling?

I was with a client this past week and the subject of forecasting came up. He's very focused on doing it well and consistently.

After the meeting it occurred to me that he was obsessed with it. It's not a judgment, just an observation. He's not the only VP of Sales I know who is really intent on perfecting it. But it made me think, with all this focus on forecasting is there any negative repercussion to it?

Don't shoot me - I'm just the messenger.

Another way to look at it is how does an intense focus on accurately forecasting help the salesforce achieve its objectives and be productive?

What are the pros and cons of an intense focus on getting forecasting right?

Let me know what you think.