The thing is Arsenal will have to think about both the Champions League and the English Premier League at the same time. But Bayern Munich is going to go all out on the champions League competition because that is the one competition they have some hope about. They are not winning the Bundesliga title. So they will try desperately to win the champions League title. That's why I think it is going to be tough for arsenal too to win against Bayern Munich in the champions League competition.
The busy schedule owned by Arsenal might be a weakness for them later, because after all, undergoing a tight match schedule certainly has the potential to reduce stamina and is also prone to causing player injuries, the only solution Arteta has at this time is of course to rotate players as best as possible, but the problem at the moment is that it is difficult for Arteta to rotate players by making Arsenal still have a good performance in those games, because if you look in the league when Arsenal play small teams, they also field their main squad and I think Arteta doesn't have a lot of confidence in the reserve squad he has at the moment.
Unlike the case with Munich who even now I don't think they care about the league championship, because after all the Champions League trophy is the only target they really have to get this season, and for sure that will be their main focus rather than having to think about the league that there is no longer hope for them, Bayern Munich's motivation and awakening in the Champions League as it is now should be wary of by Arsenal.