After all, so far under Mikel Arteta's tutelage, Arsenal has focused more on its Domestic League than the Champions League. That doesn't mean they don't want trophies in this competition, but in order to remain consistent on the right track Arsenal chose to focus on their Domestic League competition. Apart from that, the competitors in the Champions League are very diverse with the depth of their respective teams. So, to stay on the right track, that's why Arteta doesn't focus too much on the UCL competition. Just imagine, just to compete with Manchester City in the Premier League, Arsenal has to use all their abilities and put in a lot of effort. If their focus is divided, then Arsenal will quickly run out of energy. however, if we look at Arsenal in the last two seasons. Arteta has built a fairly solid foundation on his team. he just needs to bring in some newcomers as the team needs, maybe after that Arsenal can become even more competitive. and it is not impossible, if Arsenal is able to win the Premier League trophy, their next target will be the UCL. although, not a very easy task.
That's what makes Arsenal so troublesome because indeed their focus for now can only be in one competition and Arsenal will find it difficult to do so in several competitions at once.
Arsenal are not a bad club but there are priorities that must be seen because for now Arsenal know that their strength cannot keep up with several other big clubs like Madrid or Manchester City in several competitions at once. Not that they also gave up because they tried as much as they could to perform optimally, it's just that in order to minimize failure so that there is no decline in performance in all competitions, Arsenal always try to try to focus on one of the competitions even though until now they are also still struggling to win but at least we can see the increase in their performance little by little it looks and even in the last 2 seasons being in the runner up is something to be praised in the EPL.