I'm sorry, but real football is not at all like how you guys are describing it. What you're describing is a video game. Managers are not controlling players' actions with vibrating controllers, and coaching isn't about choosing the right option to get a player from "red" to "green" on a little screen. Like most of real sport, actually winning is more about intangible qualities and circumstance than it is about talent, skill, or ability. The latter three will get you to the top level as a baseline, but success is not formulaic.
It's fine to say you don't like how Arsenal play under Arteta, despite all of the clear signs of improvement (both objective and subjective). It's fine to say you don't like how Arteta comes off in pressers or his touchline manner. But setting strange targets for him based on your own idea of what he should be achieving doesn't make sense. It's illogical and meaningless and contributes nothing to conversation. Look at what Arsenal are trying to do, the state of our squad, our management team, etc. and judge based on what's actually happening, not arbitrary criteria you've made up in your mind.
Saying Brendan Rodgers would've done better ignores just about everything that's happened over the last 2.5 years, let alone the last few months. Sure, maybe he'd be in a better league position, but who the fuck cares? What does that have to do with anything at this point? Maybe he'd be in worse position and would've been sacked for being an utter tool. Maybe we'd have won the Europa League, or maybe COVID wouldn't have happened. This kind of shit is not a conversation, it's just screaming into a meaningless void. Supporting a club isn't all about judging whether or not they're up your high standards, it's got to be about more than that. Otherwise, it seems a pretty fucking stupid thing to do.
Arteta will be sacked eventually, so you'll get what you want in the end. My bold prediction: the whinging and moaning will outlast him.