Does anyone actually think Arteta is actively trying to make us a worse team or trying to let players go on the cheap? He doesn't really make those decisions (though I'm sure he has a say in if he has any plan for them, but how much we sell for isn't up to him). I am sure he has specific types of players in mind for what he thinks he wants to accomplish, and perhaps Guendouzi isn't anywhere near that.
Specifically about Guendouzi, to me he seems like he has an attitude problem (fair or unfair), doesnt really follow directions and runs around like a headless chicken. Every once in a while he shines, but I don't see anything all that special about him to bother keeping him if someone else wants him. I do not think he will be better any than Rabiot (who has his own flaws). I have never watched Douzi play and think "man, now that kid's got something special about him". Just my own impression.
Maybe Arteta doesnt think he's a 'bad' player, but perhaps just not anyone special enough to appropriate his effort to. He's not solid enough defensively or positionally, nor is he amazing offensively. To me, that makes him a middle of the road decent player. At 22 years old, there should be some kind of idea as to what his main strengths are, but I simply don't know what those are.
I'm sure you guys may disagree