That's a fallacious argument... Certainly any given DM, with enough effort, can do what ever like with any game. That's not what I talking about. I'm talking about what the game is designed to do.
I dunno about you, think the game is designed, explicitly and intentionally, to accommodate a pretty wide range of character effectiveness.
The rules of 4E, for example, have very explicit guidelines on what kinds of encounters a character of a particular can handle and how powerful that encounter should be. There is a chart that lays out the DCs of "easy", "moderate" and "hard" skill checks at each level. The same goes for monster defenses and attacks at each level. PCs are expected to have attacks and defenses and damage and skills at a certain typical value in order to be able to meet those encounter with the proper amount of challenge.
And, there are guidelines on what to do if they're above *or below* those guidelines.
I haven't run enough 4e to speak to it, but my experience with 3.x is that the guidelines are set pretty low - folks who spend effort on optimization regularly find the guideline encounters to be cakewalks. But that's just my experience.
Really, dude, you're making it sound like it is rocket science to softball a little bit for underpowered characters. You and I both know rocket science - this ain't it
