Ah, but that makes it's own kind of problems when a character should have won but the GM decides that losing would be a better option. Combat helps define who should win. Just too much balance becomes the major issue.
Obviously if the GM thinks that it's true. And there's no reason that the character in question would have if that's the case.
also it creates tense moments, without them being pre-defined and the GM thinking "hmm, now we should have a tense moment"
It creates bitching about how powerful the opponents in question are.