I didn't watch this match seeing that the score ended with 2-2 in this match also they fielded some senior players even though it was not full time because they knew this was a pre-season match they were just testing the players before starting.
I can't imagine if this was a Champions League match maybe the intensity would be different. 
Yes, the match ended with a draw of 2-2. Then there were penalty shootouts won by Barcelona with a score of 4-1. Barcelona's superiority over Man City in this match, even though from the penalty shootout results, made its own pride, especially for its fans. While on the other hand, this pre-season match is actually not a priority for most teams. Even so far, Man City has lost continuously during the pre-season, right?
If it were in the UCL, of course it would be different, Man City players would appear more all out. The course of the match in this pre-season was quite different, Guardiola also seemed to be tinkering with strategies that might be implemented. However, it is still apparent from both of them that the squad is not too burdened and does not put in that much effort in the match because it is indeed so that there are no injuries.