He's a very young manager, and needs to make the first attempts to leave the idealized fantasy of his football and try to change things. Often, managers discover appreciation for different things in time, they understand that defending properly has its own merits, and is very important part of football.
I myself as a fan was like this 15 years ago, used to sniff at teams defending and being pragmatic, but in years and years of watching football, you understand the work and the merits behind that part of the game also.