On console, nightstalker invisibility makes it so your enemy doesn't have aim-assist on you, this is probably the single reason why it would be useful, but on PC since aim assist is not a thing, it is useless.
The only way to fix this is by making "invisibility" way more difficult to see on PC, because right now, a 8 month old toddler could pinpoint where an invisible hunter is on the screen.
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You have aim assist on console, also if the enemy turn invisible