Well that isnt quite what I said. His supposed lack of technique and ability on the ball has always been ridiculously exaggerated on here. He has - over his time here - demonstrated that he isnt afraid to run with the ball, can make good forward passes and through balls and some great flick-ons. But instead of being a 'hollywood ball' kind of player who insists on trying 60 yard passes when they arent on, he is happy to just keep it simple and retain possession if there is nothing on.
I do think at the moment his confidence is pretty low and it is impacting his game, because last season he proved that he is perfectly competent on the ball, people just have short memories and have been desperately waiting for his form to drop so they could get the daggers out again. He is missing chances that I would have backed him to put away last season, and is losing possession when one of his biggest strengths last year was his ability to retain the ball under pressure.
Regarding the difference in position - I agree it isnt as though he is playing left back, but there are definitely differences in playing a holding role in a 4-2-3-1, and a box to box role in a 4-3-3. The biggest difference arguably is the need for more positional discipline at present, which is not one of Fellaini's strengths (although that said, LVG seems happy for him to get up and down the pitch at will anyway).