Basic nutrition, sleep and exercise aren't being fanatical about one's health. These are quite simple things which are nonetheless extremely difficult to learn if your childhood didn't set you up for those things (speaking from experience here). Meanwhile a "miracle cure" would be orders of magnitude more impactful I agree however it is many orders of magnitude less likely to occur. Therefore, I think you're wrong. In addition, I disagree with how you're framing these things as chores and purely in relation to life extension, these things improve quality of life and are good things to spend part of your life doing.