Well done you and I get the spirit of what you’re saying and don’t disagree entirely, however if you read the book, which i’m sure you have, you will note reasons for sticking to 800 calories and that is the figure that is used from start to finish.
We are all doing this for different reasons. I am only marginally overweight (26 BMI) but my waist should be slimmer to be healthy as I get older, so for me it is about shifting that internal fat and not losing weight so much, although that will likely be a bi-product. So for me, keeping the calories to a minimum is important.
Further to the above; call me old fashioned, but I like things to do as they say on the tin!
BTW is everyone peeing like a horse too????