The only thing left for Chelsea to do is play defense against Arsenal, but they are unable to do so because they appear to not care about three points and instead want to stay in that position. Pochettino made a serious mistake by substituting them at that point when they were already winning with two goals.
Actually Chelsea really tried on that there match against Arsenal because considering Arsenal performance and how they played against Manchester city I was thinking they will win Chelsea with 3 goals, but on the contrary Chelsea performance proofs very impressive to have managed to score Arsenal first and second, I was actually surprised by there performance.
So when we talk about defense, actually Chelsea defense was more stronger than Arsenal defense on that match but however Arsenal manages to equalise and draw the game.
So yes, when Chelsea managed to lead with a score of 2-0, then of course I think Chelsea will be able to maintain the victory until the match ends. But unfortunately, Chelsea failed to maintain the victory they had, and had to accept a draw that should not have happened. Because yes, usually when the team has led with a score of 1-0 and or also 2-0 then the next, at least the team will play more defensively because obviously, maintaining such advantages like that is more important than still targeting additional another goals. Because after all, the opponent he faced was not a weak team, so of course if Chelsea did not play more defensively then that factor would provide space for Arsenal to make goals and that happened.