It's not about whether you can question his choices but more about zooming out and looking at the bigger picture.
Pep clearly has a methodology where he makes extensive tactical planning based on the opposition, and rarely makes early subs if the team he has put out are following the instructions. That's his methodology. That methodology has made him one of the most successful managers in club football across three countries. Because it's football even the most successful manager will lose games, but what "happy clappers" on here are saying is that it doesn't make sense to say his methodology doesn't work or that he should change his approach when the same methodology have brought both us and him unprecedented success.