lol im not even going to argue with you on this.... 15 min sessions coupled with a low carb/high fat/high protein diet will lose alot of bf very quickly. I just dieted for 2 weeks did 10 min cardio sessions at a moderate pace and lost 3% bf. Which brought me down to 8% for my photoshoot. I gained 1.6lbs of muscle in the process.
If you want to get into that argument. Then, cardio is pointless to begin with, it helps keep your organs healthy but to lose weight it should be left to a crutch.
Ask ramsey i had him on a diet and circut training regimen with no cardio what so ever. Ask him how is progress has been.
Everyone i train does a very minimal amount of cardio. Its boring, it burns up muscle tissue and to me its pointless.
I dont do this for a living or anything.............................