I'm a broken record here, but the problem is that Salah doesn't contribute to defense other than in a handful of games. That's the luxury we are already affording and it's not without consequence already. Throw in the silk and you lose the guy who was running himself into the ground plugging gaps precisely because of salah. It's just too much luxury unless we are playing brilliant stuff. It also puts a massive amount of pressure on our backline individually and collectively, not the best way for them to all find their feet.
You also lose the ball more centrally as you try to play through the am, further taxing us on the counter, when we are imbalanced. It's just a much much riskier proposition. Our attack needs to really be feared for it to pay off and wirtz needs to match the hype.
Maybe Salah will be asked to do more now we don't have to rely on him so much for goals and assists. Or the extra goals we score might make up for extra vulnerability.