I think it's a good idea (though I do agree, we made it a long time with the current system)!
When did shooting accurately become a bad thing???
I shoot USPSA, ICORE, IDPA and NSSF Rimfire, enjoy them all and shooting accurately is important in all of them. You say you'll have to slow down to shoot all "-0's" What about in Rimfire or Steel Challenge, there's no -1 or -3 to save you there? What about shooting minor in USPSA and shooting A's?
Let's face it the people at the top are the ones that shoot accurately, fast! No matter what they wear! Sure at club matches or smaller sanctioned some shooters with mediocre skill can spray and pray their way to a classification win, but not a division win. Sooner or later they must shoot accurately!