I find this argument opens up a can of worms. It's one thing setting an objective at the start of a season. It's another thing entirely ignoring the changing facts on the ground and sticking to that objective as the season progresses.
FWIW, I will say that I think Arteta is improving you. The concern is he isn't doing it quickly enough. I emphasise that point because two things have happened since his goals were first set way back in August:
1) The Newcastle takeover.
2) The arrival of Conte at Spurs.
These two developments are massive in the broader argument of Arsenal's hopes of finishing in the top 4 next season. Newcastle will spend huge money to reel you (and us) in. We have the gravitas of Conte's name plus (hopefully) CL money to launch our own bid for the top 4 (although knowing us we'll lose to Norwich).
Once the reality on the ground changes, the goals have to as well. That's why whereas most Spurs fans would've been more than happy finishing 5th this season, once Conte was brought in, United's collapse became clear and Newcastle's ambition began to show, it became imperative that we secure CL football next season and without question if we screw it up on Sunday, fans will be seething.
This lack of adapting to the changing reality is precisely what overshadowed Wenger's final years and tbh the decision to award Arteta a new contract when you did hints that it hasn't gone away. True, 5th is technically "progress". But when you then factor into the equation the turmoil at Spurs and United, the takeover at Newcastle, your lack of cup football for almost 4 months - none of which could have possibly been known variables back in August when 5/6th was set as the objective; it isn't really much progress at all.
It was the same lack of ruthless ambition that led to your Jan window being such a disaster too. The club couldn't see 4th being a reality, so didn't invest to make it a reality.
For all the many mistakes he has made, Levy for once did the right thing, sacked a bang average manager, appointed a top class one, backed him in both directions (he was uncharacteristically generous in letting Conte kick unwanted players out), and at least made an effort to secure 4th, which I sincerely hope we now do or this post will be bookmarked by your entire forum
I'm sorry, but looking in from the outside, I just don't get it.