It's not soccer, but I played D1 lacrosse in college long ago as a defensive midfielder. You described the challenge of taking away a player's strong side well. The issue many fans undervalue is that the defender's primary objective is to stay in front of the attacking player. This objective really limits your ability to shade heavily to the player's strong side. I often see commenters in a bunch of sports (soccer, NBA, etc.) talk about it like you can just stand to the strong side of the attacker and shut a one-sided player down. It really doesn't work like that. You game plan for star players that heavily favor a side, you are aware of it as a defender, you have help schemes set up around it but good players are always going to get chances in their strong side. You can't "take it away" like many fans and commenters claim you can.