Chelsea with this good performance against Arsenal, shows some signals that they are able to come back very strongly in rest of season. Before this match, they had some good matches but this big match is really helpful for Chelsea to feel they are like a big club again. They nearly won over Arsenal and I agree with you that if Pochettino made better substitutions, Chelsea would have not given opportunities for Arsenal to equalize the match in second half.
Pochettino managed to take control of the second half, but luck favored Arsenal. Yes, Chelsea lost two valuable points despite their strong dominance in the early stages of the second half. I was very confident that Chelsea could add another goal during the second half, but fate had different plans.
For now, this youthful Chelsea squad can extract valuable lessons from this match. Delivering a strong performance against Arsenal certainly rekindles the hope of a comeback and competing with the top 5 clubs in the EPL. Perhaps Chelsea has truly awakened from its two-season slumber.
So, it seems Man United is the next one in line that needs to start making some improvements.