For me it is just simple matter of the personnel. Our midfield balance is not right without Partey and we have had a striker in Jesus who has had a really stop start season or a not quite good enough Eddie. That's 2 players right down our spine who were massively influential in our attacking fluidity last season... Could Arteta commit a load more players forward to compensate, sure but why would we when it has got us to the top of the league..
There can be other reasons why it's not quite clicking going forward and maybe Arteta hasn't found the right blend of midfield to make it work when it has been staring him in the face (can't see it myself) but it's surprising and amusing hear that there is still this idea that Arteta intentionally doesn't want to play attacking.