An important part of a managers job is coaching and developing players so they can improve their game. Telling the defenders to lump it high and long isn't coaching and with all those years under Mick none of them have actually improved as players and now we are paying the price for it.
Mick was an international defender but yet he utterly failed to improve the defence and the way they perform. We are defending the same way now as we did under Mick but now we haven't got Murphy, Waghorn, Garner, Didsy or Lawrence to score the goals.
It had been left to Hurst and now Lambert to coach and improve the defenders to get them to play the right way - on the deck, pass out and at the same time to defend properly.
It's all very well telling the defenders to lump it forward but at what cost? Unfortunately it's at the cost of improving and developing players and that is where we are now imo but fwiw i think Lamberts coaching will succeed and that he will actually improve the defence and thus make them better players.