Who cares how the photo is shot, but matters is when you look at the photo, and wonder if the your shot is good or not. Tell your friend to shoot moving objects in manual. Think mostlikely out of 20 photos, 5 he gave up pressing the shutter cause he cannot turn the ring fast enough, 11 is OOF, 3 just make it, maybe 1 is good. For learning purposes, do try on some manual and get your eye used to seeing the image for the right focus. Auto focus is not always accurate though mostly it is, do use some fine tuning only when you have the time. I always view wedding photographers as good photographer.
They need to have the stamina to shoot whole day (for whole day shooters from home to rom to dinner)
They need to produce certain quality work as this is a important day for the two wedder
Good wedding photographer is mostly/ always alert for any shots like the bribe parents silently crying when their daughter is gettting married
Solution to their headaches, Auto and Raw. Mostly THEY DO NOT HAVE TIME TO DO MUCH FANCY OR CREATIVE SETTING WHEN ON THE MOVE.
So tell us how noob auto is???
tt time f1 race impossible to use AF, keep focusing on fence. F1 usually camp one spot den use manual focus, when car come by den snap..
back on topic..
AF is for "fluid" environment wat, when subject is constantly moving.., unless u wan most of yr picture to be out of focus lar (or unless u very zai at getting the focus right everytime)
Anyway, just use the mode which you are most comfortable with and also the mode which produces the best pictures.