Because it’s tried and tested. It requires a lot of time indeed, but the results are astounding and I’m sticking to it. :) 4 of my friends do the same thing and 1 of them was 2nd on national bodybuilding competition.
Low intensity cardio is best solution for burning directly fat and maintaining as much muscle as possible for someone natural. HIIT burns both fat and muscle like crazy and I’d do it only on juice (i.e. with hormonal support). But let’s not get off topic here. ;)