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If you look at what happened in the past, the competition between Bayern Munich and Arsenal was not that fierce because Arsenal did not always perform well on the Champions League stage, unlike Bayern Munich and even in the last meeting the two Bayern Munich teams were able to beat Arsenal easily.
Even though this season is different, if you look at the overall performance of the two teams in the Champions League match, Bayern Munich is much better than Arsenal.
I think several player injuries due to the international break will not have a significant impact because teams like Bayern Munich and Arsenal have quite capable back-up players and whatever the situation, the match between these two teams will be quite interesting.
This season the strengths of these two teams are slightly different compared to previous seasons. Arsenal was able to perform optimally in the EPL and also managed to advance to the quarter-finals of the UCL, while Bayern Munich dropped too many points in the Bundesliga which made it difficult for them to defend their title. Bayern Munich can focus more on this match after the chance of winning the Bundesliga Trophy is almost closed, the UCL is the only prestigious trophy that Bayern Munich still has a chance of winning this season.
Player injuries very often occur due to international breaks, these clubs really hope that their players can return ready to play in important matches. Losing several important players is very detrimental to the club, the coach will also have a headache in compiling the starting XI due to the lack of ammunition he has.
What you say is true, but we also have to look at the performance of the two teams in the Champions League match and must be aware that the match in the domestic league will be different from the match in the Champions League. I see that Arsenal did not perform well in the Champions League, even they qualified for the quarter-finals with struggled against the Porto side while Bayern Munich were slightly better
And I think the influence of mentality is also very influential, there is a different mentality between these two teams.
I don't mean to underestimate Arsenal, but I am quite pessimistic that they can produce their best performance in the quarter-final match against Bayern Munich, their mentality is not as good as Bayern Munich's so they will play under pressure which will make them slump.