People need to realize that Arsenal aren't lucky, they are legitimately the best team in the league this season.
However, I don't think they are much better than us.
The problem we faced all game was, despite how good our defenders were on the ball ( our defenders are better both on and off the ball than theirs), when the ball was played into midfield, Odegaard, Xhaka and Partey were always able to control it. They could hold and turn, in a similar way to our defenders. On the other hand, neither Eriksen or Mctominay had the bravery or balance to do this, hence our defenders tried to play it up to Weighorst ( who had the challenge of knowing two defenders were on him). People can insult Antony, but he was our best outlet. He did a really good job of holding onto the ball and bringing others in. Bruno was decent, as was Rashford, as was Weighorst, as were the defenders including AWB. However, when facing a team that presses like Arsenal, if you don't have midfielders that can provide numbers on the ball for you, the team will struggle to keep possession. In addition, we were very tame at winning the ball in midfield. Weighorst, Antony and Bruno did a good job at trying to win it, but once they got bypassed, it was way to easy for Arsenal to get to our final third.
Games like this are useful. I don't think any other team in the league beats us at the moment. So getting a team that can fully expose potential weaknesses highlights areas of focus for the future.
We obviously need a striker. We need to decide what happens on the right flank ( we have the players, just need to know who takes it). We also need a midfielder with the skill to play for us, but also the positioning and energy to play well in the best of games. Eriksen should be more in the rotation. We can win cups with the current team and will get top 4. However, I really think with the team we have with these additions, we can compete for everything.