I had reported a similar problem via a different thread. https://answers.ea.com/t5/Bug-Reports/Imbalanced-and-mediocre-defence-in-FUT/m-p/14294944/highlight/false#M18150
Didn’t know you already reported it.
The AI defending really gets in the way of real players. I don’t think EA factored in the fact the using the AI defence in multiplayer mode makes the games simply unplayable. Too many seal outs at a time and the AI defence is simply too perfect. Players are actually not defending anymore. Leaving defence to AI kinda feels like EA underestimated Defense as part of football. Defence is art, and the least EA should do is honour it.
I agree with your solution: dumb down the AI defence by about 70%.
Also limit the reduced version of the AI defence to only certain high OVR player and in certain contexts. AI should be an assistant, not get in the way of the players.
I must admit, this terrible AI defence kinda made me actually check out other soccer games, for the 1st time in years. I bet others are too.