Tim Sherwood makes frank statements like this because he wants to appear like he wears his heart on his sleeve so to speak. All managers can do it but it means nothing if you can't motivate your players on the pitch. The likes of Carver and Sherwood do it yet Newcastle have lost virtually every game and Villa can;t even perform in their biggest match they've had in a long time. There the sort of managers who will go overboard on praise when they sneak a lucky narrow win and will say everything is terrible when they narrowly lose. No sense of perspective, it is all an act to fulfil their egos. Much rather have someone like Rodgers despite all the stick you give him.
I would say both styles are as bad as each other. Sherwood is OTT with his heart on his sleeve stuff and BR is OTT with his BS about outstanding players and performances and his attempt to be pally with the players. Even a 20 yr old kid like Sterling has run rings round BR. Sterling has behave appallingly yet he got special treatment and no punishment for embarrassing the club.
What is needed is someone has moral and footballing authority. Managers who through experience of football and life know how and when to use each of the various levers they have. Bob Paisley and Bobby Robson come to mind. Fergie too in some respects. Rafa had the potential but his judgment of what, when and how to say something is also somewhat suspect.
BR and Tim Sherwood are just learners.