Manchester United has played friendly matches with Laliga team Cadiz yesterday that surprisingly they were lose from Cadiz with scores 4-2 although some of key players such as Martial, Mctominay and Van De Beek were played but Manchester United cannot able to beat Cadiz who filled with young players and Manchester United will do one more friendly match against Real Betis this Sunday before playing at Carabao cup against Burnley on round of 16
Opposite result was happened to Arsenal that playing at Dubai Super Cup against Lyon they can able to win with big scores from Lyon with scores 3-0 although Arsenal was playing only with young players but they can able to performing well on that match
The friendly games are just to help the coaches assess their team's performance and progress so far and it is not a competition that the fans should whine about a lose. Soon the world cup will be over and every player will be returning back to their clubs to resume the season. Arsenal also had a game against Lyon which ended in a 3 nil win in Arsenal's favour. The boys put up a good show and dominated the game so well.
I agree, it is not right to care too much about friendly matches for this reason. These are the matches where the team does not play with the team it should be, the development of the players is observed and the coaches try something new.
Otherwise, of course, a team like Manchester United would not have lost this match. At the moment, neither team is actually playing as it should, after the world cup is over, every team will form a roster as it should