"All of AoS is compatiable with the mainline MCU, it just takes a bit of thinking."
With just a bit if thinking, maybe it's compatible, but try thinking a little more.
"ALSO, Kevin Feige never said that AoS is not canon."
There is literally the "Flying cars rule" formulated by Feige in my original post:
His Foreword from the Timeline book:
It only takes a bit of thinking to realize that this applies to Agents of S.H.I.E.L.D., too. You can do it. While it's canon for Marvel as a whole (the Multiverse), it's not canon for the Sacred Timeline: "The timeline presented in this book is specific to the MCU's Sacred Timeline through Phase 4".
I expect AoS to be included in the post-Secret Wars universe, but it won't be the same universe/timeline anymore, as it will be partially rewritten, entering a new cycle of existence. This is part of the hint, but for now and for the released phases, it is irrelevant.
"There are multiple exclusions from the Timeline Book and Disney+ timeline that are considered MCU canon"
Like tie-ins and small details? Well, that makes sense, doesn't it? Or do you consider something else canon that Marvel is not aware of?
"even in the Timeline Book, it was said that it's not everything in the 616/199999."
Yeah, because they're making new movies and series, and most of them take place within the Sacred Timeline. Why wouldn't they include the main events of the show if they consider them canon? They even included events from the one-shots! Think a bit.
P.S. Are you from the Big Brain wiki team? Asking because they share the same arguments and fallacies, thereby breaking their own timeline. Speaking of compatibility.