I dont think Coutinho should be benched, he needs to play.
Its not like he has a contract until 2023, he has this one season to prove he should be bought.
While at it - so far, so good. He gives a whole new dimension to our attack, attracts players to him which enables vast spaces on both wings and in the middle to Lewa. I can't remember the last time Bayern had that good of a player for the #10 position. Its sure refreshing to see, other than spraying balls to the wings and hope they deliver. Plus - other teams just know this guy CAN harm you with shots, so they tend to stick to him, opening up spaces between that line and Lewandowski.
And one other thing - I surely dont think he will "fold" when the big games come. I'm sure he thrives for those kind of games. Those "dancing queen" feet will do their work

I'm much more concerned about the spaces between him and Thiago/other dude next to Thiago. You could just plainly see in our last game vs Tottenham how disconnected that line was until Thiago came.