Ever since he stormed out of the stadium last April, I've watched closely. The articles all referenced his indiscipline and disregard of instructions. He pulled this **** under Guardiola who found him hard to manage.
Whether he's frustrated is irrelevant. Doesn't excuse poor professionalism and such a poor attitude/team ethic. He's partially responsible for this.
There's no excuse for ignoring the gameplan. You either put up or go. You don't storm out of the stadium when suits substituted or storm out of training when you like. He shows a complete disregard for teammates and doesn't listen to tactical instructions.
While I agree that Wenger is tactically ambiguous, it's a disgrace that you praise Alexis for being such a poor professional. This isn't to do with Wenger's future. Alexis isn't the football manager. Alexis is a partial reason that the tactical approach doesn't always work.
I agree that Alexis is a poor professional. However, I do feel you are ignoring the larger problem which really comes down to the lack of respect Wenger has among the players that some of them are openly defying his instructions. Also if he really wanted to punish Sanchez then the way he went about it was a disgrace and would only exacerbate the problem.
I hesitate to bring up this example because it might seem like I am banging my own drums but look at the way Conte dealed with Costa when he showed attitude. Straight out of the squad and he only was included once he apologized. Now maybe Conte might not have continued with that approach if we started losing games but it sure as **** was a better way to start things as compared to Wenger.