Like firstly, it's great, and it's also really connected to the MCU, every complaint can be rebutted.
The largest complaint: No mention of the snap, is just stupid. Firstly S6 was set about a year after the snap, and everyone was really busy, half of them were rebuilding S.H.I.E.L.D, and the other half were looking for Fitz. Also, there's a flashback in Echo set in 2021 (I think it's the first episode), and that is during the Blip, and there's no mention of the Snap, does that mean it's not canon? NO, Echo is canon.
No mention of AoS in the movies: They didn't even know Coulson was alive, except for Fury and Hill and why would they tell the Avengers, and they were also busy with Ultron, then the accords, then half of them were on the run, then Infinity War, so they were preoccupied.
Not in the Timeline Book or Disney+ Timeline: Well, the timeline book didn't even include the Netflix stuff, and that technically fits into Phases 2 & 3, and as for the Disney+ timeline, for the Netflix shows, they're placed by first season timeline, but the first season of Agents Of S.H.I.E.L.D. is all over the place, because the first few are after Iron Man 3, then after Thor: The Dark World, then after Captain America: The Winter Soldier, so where would they even put it?
So genuinely, why do people think AoS isn't 616 Canon?