FA Cup is not important with Liverpool because they still have Premier League and Europa League to fight. I am sure that Klopp learned a lot from two seasons ago, when Liverpool aimed at many titles, managed to have chances winning them all but at the end, they failed. One season after that, their players began very poorly and many players got injuries, which cost them a position beyond top four in the last season.
I believe Klopp will not repeat that mistakes with overwhelming ambitious targets in this season and they might sacrifice FA Cup to focus on Premier League and Europa League.
This season, Liverpool have many players, Klopp can substitute any player he want without need to worry lack of player.
FA Cup might not their goal, but they will try their best because if they able to beat Arsenal, it means one of big competitor will out, so they will have more bright future.
Liverpool have a tight schedule, they also have EFL Cup.
One thing that I want to comment about Liverpool is, they don't have a player who can score like Salah. I hope Klopp will sign a new striker, don't put a big hope to Nunez.