I think BMR gives one a general low calorie goal to shoot for to avoid starvation mode. The formula probably uses an average LBM of the comatose person including differences for age and gender. It does not, of course, take into account other factors that effect weightloss. TDEE can tell you generally where to stop and allows me to eat more when I need it.
When I am not binging, this works for me for weightloss. Maybe it is the exercise factor.