I've encountered quite a few instances where I see my teammate holding an angle from the minimap and I trust them, but then I get shot by an opponent who my teammate should have seen and killed. I thought I was going crazy. But nope, the vision cones in this game are totally broken. On many angles/corners of all maps, you can find these examples, just check where my aim is and compare it with the vision cone on the minimap:

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Haven A Long into site: https://i.imgur.com/774ycXn.jpg

Haven mid Window into B site: https://i.imgur.com/OMsKEzU.jpg - To be honest this is just absurdly stupid..

Bind CT spawn to pipes/heaven: https://i.imgur.com/HlzPTnl.jpg

Bind Tower to showers: https://i.imgur.com/xykl5g0.jpg

Bind Lamp to A short: https://i.imgur.com/ypA7UYt.jpg

Bind A short to Truck: https://i.imgur.com/untyAq9.jpg

Bind B Long to B site: https://i.imgur.com/F0Lprii.jpg

Ascent Mid top to Mid bottom: https://i.imgur.com/94T1PE6.jpg

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and none of these are like by a hair or something, all of them are egregious. Just check how much of a distance I have to sidestep to be able to actually see Ascent mid bottom from top mid: https://i.imgur.com/igwm30b.jpg

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I was too lazy to find some on Split too and I'm sure there are tons more in all of the maps. All this took just a 10 minute quick look by myself.