Actually with the look of things Arsenal may likely be kicked out by Bayern Munich on the champions League quarters finals because Bayern Munich are always more favourable than Arsenal on champions league that's why they have more good history on champions league than Arsenal, although is been a while Bayern Munich meet Arsenal but I think Bayern Munich has more opportunity over Arsenal on that match and also considering the fact that champions league is not like premier League that are more easy for Arsenal to perform really good but in champions league the matches are mostly difficult because all the clubs are very strong, although I'm not disputing the fact that Arsenal is not in there good form but the truth is that Bayern Munich is a very consistent team when it comes to the champions League matches and also if you you check there last meeting with Liverpool you will see how good Bayern Munich is and beating Liverpool at the end, so if bayern Munich could perform that good it may likely not going to take much time for them to win Arsenal. So I would just say that Arsenal should focus more on there premier League matches so that there attention will not be divided.
However, Arteta will not just leave the UCL just because Bayern Munich is favored by many parties, but did you know that Bayern Munich is not like it used to be. It's the same as Arsenal in Arteta hands, so both teams have the same chance of qualifying. Bayern Munich is also experiencing a bit of a mismatch between the coach and the players, plus this season will be his last season with Bayern Munich, or it could also be due to the habit of Bayern officials who fired him early. Don't be surprised by the tradition of dismissing Bayern Munich coaches, because as long as they don't meet their targets, Tuchel will suffer the same fate. Compared to Arsenal today, both sides are solid, both coaches and players. Why is this important? Of course, on the field, synchronization is important to build cooperation, and in playing solidly, Arsenal is clearly superior.
I agree with you, even though many people favor Bayern Munich, Arsenal cannot be underestimated, indeed in several years Arsenal has not participated in the UCL competition, but Arsenal's performance in the last 2 seasons has improved rapidly. Last season, Arsenal was able to compete with Man City in the title race, although had to end up in second place but that is a good ranking and this season Arsenal are still competing fiercely in the EPL title race with Man City so for Arsenal's current performance Bayern Munich will experience different difficulties during the last meeting between the two where Arsenal have not been coached by Mikel Arteta and Arsenal difficulty beating Munich.
Don't just say that Arsenal was beaten by Bayern Munich with a fairly large score, it doesn't mean that Arsenal this season will have the same fate, in terms of the chemistry and cohesiveness of the players and coach, there is no doubt that they have worked together well so far and that is very important to bring the team together achieve success.