Naturally. You can't win every game. That's football. No team ever has. No team ever will.
But you keep believing and repeating what has always worked for you, that you fully believe in, and you'll win more games than you ever lose. Same bollocks when people go on about Klopp not having a plan B costing L'pool. Poor execution of the Plan A is all that's cost L'pool. A style that's proven to work against anyone. Barca brought it home again to me against PSG. Barcelona don't change for ANYONE! And it's lead them to being the team they are today. Tweak little things like your formation when different players come in. But your style of play, which should be decided the pre-season, should be what you stick with through the season if you want consistent success.
If you fully believe in what you're doing, and it's proven, then I'm 100% behind keeping on doing it. Eventually it'll click and you'll win far more than you lose. Peps style is unstoppable when it's flowing. When he sorts the squad out they'll be no bigger threat this Country than City.