He’s not had a full season in charge, what you talking about? Emery had two summers to get his ideas through.
Arteta also won a cup and is now in a EL semi with teams of a similar level. He could win the EL.
Next season he gets sacked if the league form doesn’t improve.
They’ve been in charge for similar amount of games. Emery was here from the end of may 2018 (He took charge of the club in June) to The end of November, 2020. So he’s had roughly 18 months and two summers.
Mikel Arteta has been here December 2019. He’s been here for 16 months. 1 summer and a long mid season break to work on tactical things.
As for their sporting achievement in his first full season Emery made a EL final and finished 5th. In his first full season so far Arteta has made a EL Semi final and is currently 9th. Arteta has won a Fa cup but he also dropped out of the EL very early in his first half season. Emery had the 22 game unbeaten run and was within a few points from CL.
Over the course of their careers at Arsenal Emery has been the better manager and more consistent with results. Also on the performance side his team played better than Arteta’s. Emery’s squad was more imbalanced and he still did better.
The notion that Arteta has not been given enough time is fraught with falsehood. He has had enough time. He’s just not good enough.