I think many have been guilty of overstating the importance of the formation (myself included). One thing I've noticed is that in spite of us playing such a high line, either with a back three or four, very rarely do opposition players get caught offside. Players seem to go on a frolick of their own with very little awareness of where their team mates are. We used to play a great little offside trap on the edge of our box which worked a treat but it seems to me very little thought going into this sort of thing now. It's like the players aren't even aware of the offside rule. There also seems to be very little communication going on since Hart left. What Pep said today about having "no defence" is very worrying. His attitude seems to be that it will take care of itself once we have the right personnel rather than trying to improve what we already have. I'll be accused of being a Phillistine by the Pep fan boys but the sooner he realises that you cannot simply rely on having better players as he did at barca and bayern the better. We're not just going to steamroller other teams as the gap in quality has narrowed significantly in the Premier League..more so than in other leagues. Some thought needs to go in to trying to stop the other team from a defensive point of view. This seems to be entirely lacking at the moment.
I think you may have misunderstood the reasons for us playing a high line. It's not so we can play an offside trap.
Pep has said he spent his whole career attacking small spaces and defending big spaces. To play like this gets the most out of small, technical, creative players. Players like Silva, Gundogan, Aguero, Sterling etc.
By pushing the back line right up, it forces the other team to drop deep towards their goal. This means there is very little space in their half and around their box. The idea is that our smaller, technical players are going to be better than their defenders in these tight spaces.
So the main purpose of the high line is an attacking one, not a defensive one where we're hoping to catch them offside.
In Spain and Germany he managed to play this system very effectively because he knew opposition would be forced in to only playing on the counter attack. So he would prepare all week to nulify the opponents threat on the break. It was very successful for him, as it was for us early on in the season.
But the difference is in England teams aren't afraid to just launch the long ball forward and hope for scraps. This is what Guardiola is talking about when he says "in England you need to control the second ball". Teams in Spain and Germany very rarely play that long ball, so it's a new threat he's not faced before.
My view is that with 4 at the back we are much more capable of dealing with the long ball. Having 4 players spread out accross the width of the pitch means you have enough bodies to deal with long ball counter attacks and not have your defenders isolated 1v1.
Playing 3 at the back with a high line is extremely vulnerable to long balls when you don't have defensive minded wing backs (which we don't). Teams can just play a long ball down our left channel and it will lead to a 1v1 foot race between Kolarov and Vardy or Kolarov and Willian or Otamendi and Costa or Clichy and Lukaku.
They're all mismatches. Our players don't have the pace or strength to deal with those opponents 1v1. The results when playing a back 3 prove that. But we didn't encounter the same problem when we had 4 at the back earlier in the season.
It's been a feature of English football for as long as I remember. Very rarely do teams play 3 at the back, unless they plsy deep and have defensive minded full backs, like Chelsea this season. The last time I remember a team even trying 3 at the back with a high line was AVB at Chelsea and it was an absolute disaster.
I can't remember a single team playing 3 at the back with a high line and being successful in England. Not one. And my personal belief is the reason why is because of the long ball. It's a unique phenomenon to England that they don't see much in Spain, Italy or Germany.