There was a time in which Adam reached out via twitter and asked for more example videos to be shown. To be fair, they did sort out the defensive midfield issues in 19 and 20, but it took a while to get there from 2017.
The biggest issue I see now is the passing lanes not being blocked. In addition, the defensive third attitude is lacking. The ball can be moved from side to side with no resistance, regardless of tactics or aggression level defensively. Instead of being 2-3 steps off to reach the ball carrier, they are 7-10 steps. Example here:
From the video, it's plain as day. The central midfielders are several steps behind. There's no reason to be. This is a team that is tactically set up to be aggressive. When my midfielder receives the ball, you'd expect someone to be there - even if they set up defensively conservative.
Now my midfielder collects the ball, yet the two opposing midfielders are still in their exact same spot. They are in the "Ready" stance to engage, but why are they so far back? There is no sense of anticipation here. My midfielder can turn and face with ease, and draw in their midfielder to take him on. Even when the does happen...
You can see next that the other midfielder near the wing doesn't close down the intended recepient. Why not? If they are going to be 7-10 steps off the pace directly in front of the ball, then at least please put some pressure on the intended recepient.
I can easy cycle right back to where the ball came from. Why? Because the central midfielders again have dropped back into their pre-designed spot and are starting the whole sequence over again. It's a reboot of illogical standards. Any of them should be closing down the intended recepient here.
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This is 99% of the issues with the midfield in this game. They are not engaged with the intended recepient, and as a result the passing lanes are completely open. It is literally school-boy fundamental zonal defending being taught here. Any coach worth their salt teaches the position defensively of where the intended recepient could be. This is why when you go into advanced instructions hoping for a gegenpress - it's not a gegenpress at all. A gegenpress does not just press the ball carrier, it presses the intended recepient(s). The gegenpress cannot even take shape because the base fundamentals of this defending logic isn't even existing in the most basic forms yet.
If the real sport followed this logic, players would just stand there with the ball to draw out defending midfielders all match long. That is why it's so easy to pass in this game, and that is why it becomes lifeless in the spots where there should be moments of confrontation. Those who say it's because you're on PA1, that is just scooting around the core issue. The issue is that PES 20 struggles to grasp the concept of how to properly put pressure on the ball carrier and the intended recepient.