Let it be clear, Lampard needs time. No matter who had been the manager, one would have needed time with this gang. Because you basically have to replace this whole gang to be able to get something similar to success.
What I criticize is his belief that these players have underperformed due to low self-esteem. I have no belief that Iwobi will suddenly become such a much better player just because Lampard is the manager. Both Ancelotti and Benitez have questioned the players 'character, and it's more about the players' personalities than something fluid like self-confidence. So I hope he does not fall into that trap.
I also do not think it was a smart idea to bring Ali from Tottenham. A player who has underperformed in recent years, and who has been accused of having a bad attitude. Among other things by Mourinho, and now Conte has got rid of him. I do not think this is the kind of player Everton need.