You know, sometimes it is not about experience players in football. There are times that luck works in these things for Arsenal to lose a match to Bayern Munich. It is not that Bayern Munich are that better than Arsenal, as you are saying. It is obvious that Arsenal are better than Bayern Munich in everything. I can argue this one with you in terms of players, performance, and everything else.
You cannot compare Arsenal to Bayern Munich. I believe that sometimes Arsenal make some wrong move that will affect them, but that doesn’t mean Bayern Munich have more experienced players than them. Arsenal has a good squad with talented players. Arsenal always starts the season with very good performances.
Eliminating too many unnecessary mistakes has to be something Arsenal needs to take seriously, they should work on making sure they are able to reduce the amount of mistakes they make to the least minimum such that bid there be any, it wouldn't be at crucial times such that it's going to affect them in the nearest future when they are going to need the games the most. This was exactly what happened to them lest season, they are a very good team, they are able to do well and still be able to win trophies but they have to be more particular about been accurate with their performance so much that they become timely with what they get as results at every time. Bayern Munich isn't a bad team, they are good in their firm and has been making good results in the bundesliga for a very long time now, the depth of the Bayern squad is aswell a very fair one and so is the depth of the Arsenal squad too, so personally I see some level of equality in strength and not superiority of one against another, it's basically advantage of Chances that will give one victory over the other if they get to be in a particular fixture at a point in time probably in the champions league.