Brighton drew 2-2 with Nottingham Forest at home. Despite falling behind in the 13th minute with a penalty goal, the home team equalized with about 5 minutes left in the first half and managed to take the lead in the last minutes. Brighton couldn't maintain their 2-1 lead in the first half and conceded the second goal in the 70th minute. I think it was an important 2 points lost for Brighton who had more possession and created more chances than their opponent.
I noticed that although Brighton had more possession than Nottingham Forest, Nottingham Forest showed that they can score goals without having to play a lot of the ball, this shows that the quality of the offense done by the Nottingham forest squad deserves appreciation because they managed to make Brighton not get a victory with their power to play the ball.
City - Arsenal match ended 2-2, but Arsenal would have won the match very easily if Arsenal had not been down to 10 men.
While the match was 1-2, Trossard received a red card for the second yellow card in the extra time of the first half and Arsenal were down to 10 men. In the second half, City attacked the Arsenal goal for a goal, but Stones scored the goal they were looking for at 90+8. Extra time worked very well for City today. With this draw, City increased its points to 13 and continued its leadership.
Yes, since Trossard was taken off the field Arsenal didn't have much effort in counterattacking and playing the ball more, actually this is an interesting game if Trossard was not taken off, it might be true as you said that it would be an easy victory for Arsenal because they took the lead before the situation was reversed in the last minutes of the second half which ended with a draw, even though I know Arteta is fully focused on playing defense but still they conceded and had to give Man City an equalizer goal.