Yes it's not easy for Arsenal to reach the final, I'm not an Arsenal fan but for now I love this team, they really worthy to be in the final, also Premier League is the most competitive league but Arsenal can still stay at the top of the standings. For the upcoming matches in the next few days. To be honest, I also agree about Barcelona, they are the strongest team at the moment, they have great players but back to the coach's strategy.
Arsenal are focused on the Premier League, I'm sure they don't think much (if not at all) about the Europa League. As for Barcelona, even if it is a favorite, the bookmakers quotes are simply ridiculous:
UEFA Europa League 2022/23 - FC Barcelona reach Round of 16?
Yes - 1.57
No - 2.25
Being able to beat underdogs with a great percentage of efficiency is certainly good, but in big games Barcelona is weak this season.