I dislike this ticket because it is attempting to address many very different issues at once. We have accuracy, spotting time, seeing/shooting through bushes and ai reaction to incoming fire all being addressed in one ticket. I think it could have been a bit more specific.
While I agree that the ai spotting is far too simplistic and fundamentally flawed, resulting in ai that can detect you far too easily, I disagree that the AI's accuracy should also be made worse.
Instead I think that the user should be able to easily change accuracy ingame. Ie. BIS should make a precision slider as well as a overall skill slider for friendly and enemy AI. This is so that players, mission makers, and modders alike have the ability to configure the ai's accuracy however they like - a mission maker might want an ai sniper to be capable of headshotting you at 800 metres away. A player might want to have a real challenge against the ai by making them super accurate. Simply decreasing the ai's accuracy like suggested would make it harder for these people to get what they want.