I think you missed the actual mechanics of the proposal. The idea is that the IRS sends you something that says, "This is the information we have. This is what we think you [owe use | we owe you]. Sign and return if you agree." If you agree, then it takes you a few minutes and you're done. For many people, who have "boring" taxes, this would work great.

But if you don't have "boring" taxes, then you could still do them yourself. The idea, though, is that relatively few people have to do this.