But the issue for me is that everything is inter-related.
If you look at the picture I posted, you can't actually play fast when you set up like that. Roma's 3-5-2 allows them to have 2 extra midfielders. And all of those 5 were compact and went narrow. So you had 5 (!!) Roma players blocking our 3 players (for some reason Roberto did many runs off the ball to win headers vs Kolarov). If you play rigid (not allow players to vacate their positions and look for pockets of space) then it is impossible to find players to pass to, because everyone is man marked (and doubled in key areas). When you are man marked, you need to move. And if you move, your teammates need to adjust their position as well as to keep a compact shape.
We do not move enough of the ball, and we do not attack space. We play as if we have different players than we do.
Yes, Liverpool played long balls, but look what type of long balls they were. They were future position long balls, meaning you don't pass the ball to Salah so he can try to win a header vs Kolarov
lol
. You'll fail and give away the ball. Before launching those long balls, the players in Liverpool's team (Firmino, Mane etc.) did many false runs, with the purpose of tricking Roma players as to clear the space where the long ball would've landed. Each long ball was actually played in space. Without those runs from the forwards, Kolarov is reading the long ball in time (vs Barca he didn't have anything to worry about since Suarez is 2m offside on the other side, and Messi is 10m offside). So that long ball becomes a stupid giveaway, since Roberto could win maybe 2/15 headers against Kolarov.
Liverpool's long ball were part of some pretty advanced tactics of finding the free man, compared with what we did. Liverpool forwards drag Roma players out of position, then long ball is played in the hole, exactly in the position that is being vacated by the Roma defenders. Without making space to land those long balls in, there's no point in doing it considering Mane, Salah, and Firmino are 1.75m and Kolarov, Jesus and Fazio are over 1.85 (Fazio is 1.95).