When Arsenal managed to qualify it meant they could not be underestimated, for whatever reason Bayern Munich also had to be careful, after all both teams could fight each other 50:50 both of them were equally strong. I will not take it lightly, that the conditions of each team are different and in the hands of different coaches too. For this reason the meeting between the two is not just about experience in the UCL anymore but a battle over which coach tactics are effective. I think Arsenal can still beat Bayern Munich and that has huge potential. Bayern Munich itself now relies on Kane or Sane, while Arsenal strength is more evenly distributed, the same as Manchester City. Each line of Arsenal players is quite solid.
indeed your statement does hold truth there's reason why arsenal managed to qualify but we also need to see past histories of both team how they fare so far.
there's also chance that arsenal might qualify because of sheer luck, that should also be considered into account, because right now bayern munich also have a lot of history of solid wins i don't think its gonna be an easy game for these two teams but i rather prefer bayern munich i might be biased though with my judgement but also i favour bayern with a reason.