If this was so easy then we wouldn't be looking for new managers every couple of years!
He has not been brought in to simply put an arm around the players, improve morale and climb a few pointless places up the league. He's been brought in with a remit to install a new culture at the club (as proven by the Rashford situation), implement a new style of play, and oversee the phasing out of a lot of the older and/or less adaptable players (Antony and Rashford have already gone and I expect to see Casamiro, Eriksen, Lindelof, Evans, Malacia, and at least one of our keepers leave in the summer). If you just wanted a few more points on the board then maybe you'd have been happier with Moyes?