Recently everyone has been telling me that I should be back button focusing and they get pretty aggressive when I say I don't like it telling me it takes 5 minutes to get use to. I always say you shouldn't listen to people like this but their aggression makes me want to scream at them.
There is a reason why I don't like the back button focusing, I'm odd eyed, meaning I put the camera to my left eye rather than my right and if I back button focus I poke myself in the right eye. Could I change and use my right eye, maybe but probably not. It would be like changing from left handed. To me it's one of those thing out of our control.
So do what works for you and don't listen to these people who try to force their opinions on you.