Let's get over with this now! Arsenal has no chance of winning the Champions League. That'll be considered an expensive joke. They should focus on winning the Premier League this season and not prioritizing a competition they know quite well they can't win.
They've had a remarkable season last season, so I expect them to use that energy and motivation towards getting the Premier League job done.
I didn't expect them to drop points off against Lens though, they shouldn't have lost that game. They should be very focused when they face Sevilla ahead. Sevilla now has a new coach, so they should expect something different and tough.
I quite agree with you that Arsenal in the Champions League is not a team that is likely to be able to become champions and that is due to many factors, but that doesn't mean they won't struggle to perform well or at least get far enough because as far as I know Arsenal don't have enough. good statistics in the Champions League so when they can reach the semifinals or maybe the final even though they don't win it is still a big achievement for this club because when they were in their glory days with Arsene Wenger as coach they also couldn't do much in this most prestigious tournament.
Focusing on the English Premier League would be very good because the league title is also quite prestigious, especially since they haven't lifted the league trophy for quite a long time because Arsenal was quite weak for many seasons after the glory days were over.
The match against Sevilla in the middle of the week will certainly be very important for Arsenal and this match will be a big challenge for them if they lose it will make them drop even more.