Who is stopping this athlete from choosing the option of participating in the no-enhancements category?
Having multiple categories doesn't really solve the problem. First, it divides the market, and second, anyone who uses enhancments and can get away with it in the unenhanced category still has an advantage.
Extreme training is already "screwing up the body". Look at many marathon runners drop dead from heart attacks before they're 40.
Yeah, but extreme training plus lots of drugs is probably worse than extreme training on it's own, right? I mean, HGH could make extreme training healthier but it would probably be more than counterbalanced by steroids and the rest.
But is moderate drugs + moderate training worse than extreme training + no drugs?
I guess my point is, that it's ultimately up to each competitor as to how hard they push their body.