Well, I don't know about Barcelona, but I'm very worried about Real Madrid and their new coach. As a Real Madrid fan after that defeat against PSG, I see that Xabi still has no idea what to do with the squad. I'm afraid Real Madrid will become like Manchester United or Barcelona when they were in crisis. I don't see Real Madrid playing friendlies to see how the coach will deploy his players and what performance we can expect from the team.
It seems you have forgotten so quickly, Real Madrid played the FIFA Club World Cup, Barcelona did not. All that time they have been resting so it's quite understandable that they have started their friendlier earlier than Real Madrid who are also probably resting for some time. So no, as of now, he is not clueless or making players lazy.
I think Xabi needs time, I don't think it should be fair to criticize him based on that bad performance vs PSG