#1 Guardiola doesn't learn from past mistakes

Guardiola is a brilliant manager and has been killin' it in the Premier League this season. He has made Manchester City one of the best teams in Europe and their style of play is something everyone loves watching.
However, he fails to twerk his tactics when needed. The former Barcelona manager is a bit stubborn when it comes to tactical changes and that has cost his side a lot of matches.
The best example is the Bayern Munich loss at Camp Nou, if not today's game. If he would have gone a bit defensive at the start or when they conceded the first goal, City might not have lost by this scoreline.
His failure to make the small changes in his tactics are going to cost him a lot of big matches and that's something he needs to work on and fast!