I also see Arsenal as a team that can still be quite strong next season so that some of their closest rivals last season also still have to be wary of Arsenal as their competitor in the race for the Premier League trophy. Likewise in the Champions League because Arsenal could perform better next season and be able to reach a quite crucial stage so that their rivals will still see Arsenal as an opponent that needs to be eliminated early before heading to the quite crucial stages in the Champions League.
These expectations are very similar to what we expected last season but in the end Arsenal were nothing more than a mediocre team in the Champions League competition. They didn't have the conditions to get close to the semifinals and instead they had to fall after successfully qualifying from the group stages.
I don't think any team is afraid or worried about Arsenal's presence and in fact other strong teams are wary of teams full of history who have always been regular champions of the league. Maybe Arsenal is very scary for any team in the same group but after that they are nothing more than a team that can be knocked out easily.
I don't know why some folks here are hyping Arsenal in UCL when we know that they hardly escape the round of 16 in this competition because they are always confused somehow and lose focus in the league. No matter how Arsenal performance is on its peak, they don't show that in UCL maybe it is because they are playing with clubs that are not in EPL.
Playing with a different club that is not in their domestic league is always a big challenge for them and for you to be a strong and recognized club that other clubs will be careful and scared of, you must show how strong you are by winning many clubs in UCL to the semifinals or the finals. I would not say that Arsenal lacks experience in UCL because they are always present in most UCL competitions.