I know that's why they put them in. Monte and others have said so in almost those exact words.
However, Monte has also said that they underestimated the players willingness to part from the old school of thought, to a certain extent. In addition, what we're talking about here is are those elements essential to a successful RPG? Are those the reasons for D&Ds success, or is that just an artifact of "old schoolers" like yourself who don't want to change?
I think it's the latter. Hit points, classes, levels: those aren't inherently superior to other RPG designs, they are just legacy designs that remain with us because that's the way it was done first, and now many D&D players won't want them to change because they are part of the D&D heritage.
That's another issue entirely.