I think that Intermittent Fasting is a misnomer - and people think it is extreme or dangerous.
"Not Eating All Day" means what it says - and does not seem to be extreme or dangerous. NEAD does not include 5:2, 4:3 or ADF... but, if calling IF NEAD helps get people started working towards 16:8... would it not help?
A 21-day Water-Fast is extreme... and should not be undertaken without medical supervision, but we do not 16:8 "tarred with the same brush"?