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If you are a pro archer, then it isn't a big deal if you have green arrows or not since you know your shit. But for scrubs -like me- it is godlike, because all I do is watching the arrow, where it lands, then aiming better.
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This.
And about macros, its not only about feinting, its about blocking too.
The main problem of a manual blocking in crpg is that you want block left but your mouse block down.
To avoid this people could use macros, you hit an additional button on your super mouse and it blocks left without mousemovement.
You can program your mouse or use autohotkey for such things.
If someone play crpg over years all his free time, why should not this guy buy a mouse with 6 or more buttons and use it.
In order to make macros useless you need make the old faster gaming speed, so people will not always be able to hit the right button on their mouses.