The players let him down, but he also let them down.
He can't be switching things up as often as he does as he did today, like Walker at CB, thinking Gundogan could pair with the new Philips to cover the midfield like Bernie, or not just the personnel but actually changing the system entirely from a previous win.
Pep SHOULD know the players need consistency, if he still doesn't know how he wants us to set up, then that's a problem. All our title winning season had a clear formation and style of play, even with personnel changes, that made us work.
Simply rotating alot isn't bad perse (except maybe defense literally every game), but it's more the extra stuff Pep does that I have an issue with.