Actually Arsrnal lost their 'style' under Arteta.
Not really.
This is the guy who believes in his vision, believed football can be played with calculator and genius coaching.
Getting rid of quality players for the sake of team style is his stupidest decision. How can you get rid of Guendouzi and Ozil? It's because he thinks he can setup the team with his genius tactics!
Play style can take you so far, when that soured down, your top players will bail you out in difficult situations. Right now, Arsenal only have one coveted player in Aubameyang, others can go to Championship and nobody would take them away.