I don't remember Arsenal having any good success in the Champions League. Almost 20 years ago they played in the final against Barcelona and lost. Then a few years ago they played in the Europa League final against Chelsea and lost too. The younger the squad, the less experienced they are. So it seems to me that they will fail again this season.
I remember very well the time in the champions league final against Barcelona, but with the state of Barcelona, which was so feared by all of Europe at that time, Arsenal could not beat them. I don't think Arsenal will likely get any further than the last 16 and even so they should at least prove that what we criticize them is not true. Even if Arsenal try, they will always fail when they meet teams from other leagues such as Real Madrid, Milan, or even PSG. In addition, if Arsenal meet Manchester City in the preliminary round, it is certain that they will return home early.