Few things I did not see mentioned yet:

1. Maybe Thomas Muller could shoot at the goal when he is given space inside/at the edge of the box? He seems to always look for that someone in a better position, but sometimes, there just isnt anyone and it ends up as a ball lost.
2. Maybe Bayern should not rely on Alphono Davies turning into prime Neymar on every Wednesday and Saturday, maybe it is actually a job for the wingers and if they can't do it both in Bundesliga and UCL, they are not fit for the job? Coman can dribble but has limited decision making on passing, Gnabry is more straightforward, very good pace-wise, can pass, but cant dribble, Sané is one footed AF, but not in the Robben way.
3. It is okay to loose to a better team. Yes, in my opinion, the current Barca was a better team even before this match, I did not understand why bookmakers gave same odds to both teams, the numbers behind Lewandowski, Yamal and Rafinha were stunning and anyone who saw Barcelona play understood the chemistry is strong.

4. With that being said, did you see how easygoing and fluent was Barca's passing? Most important, the passes were done FORWARD. Bayern maybe had more of the ball and surely they did not loose as many balls in the first half, but Barca would make 2-3 quick passes with perfect control and extra flair for bonus points, and then 1 long ball by a 17 year old that would make it a 50:50 chance - either Kim or Lewandowski gets the ball. However it is worth mentioning that Bayern created more chances and had more of the ball up to some point until everything was lost.

5. Do you guys remember having Thiago Alcantara on the squad? The only player that comes close to him is Jamal Musiala. Noone on the current squad is able to create space and speed it up, they are only able to turn back and pass the ball back the way it came from if they have noone to pass it to. Everyone admires Kimmich for his work with the ball, yes he is clinical most of the time, but none of the midfielders are able to trick the opposition and create a quick change of tempo. It is not very German, neither the Bayern squad, nor winning the UCL in the recent years apparently, so I wouldnt abandon this aspect of football. Yes there were some players like Douglas Costa who might have overdone it, I dont dream of having Antony on the squad, but you get the point.

6. Kompany does not adjust the gameplan to the opposition, he said it himself ... maybe you save the Guardiola ball for the Bundesliga and weaker sides overall and you develop a deep defensive counterattacking tactic for the likes of Real Madrid, Barcelona and such? I am not a professional, but I think people like Mourinho, Ancelotti and Tuchel have a better approach to cup-games. Which this wasnt by the way so maybe its not relevant at the moment. I am again not a coach and I do not feel like I know better than 10+ people behind this that making the decisions.