What happened was actually really funny (and annoying). Verant nerfed the CoS because they said having instant click invises broke the game.

Then they put the Luclin AA's out on Test which had instant click Camo and IVU, and when people pointed that out Verant was like "we answered your demands, guys!"

Having instant invis on an FDing class really does though :/. And by the time necro's got an instant normal invis AA it was less relevant.

Instant Camo for Druid/Ranger wasn't really comparable to CoS on Necro/SK.

I see it being borderline broken only in a couple of situations in which you can FD flop past invis mobs. Other than that it was kind of a weird reason to nerf the item, because by that time there were so many of them out and they left pre-nerf ones alone.

What's also funny is Luclin introduces the Coterie Death Mask which actually is OP as fuck at least for Necros. That gets nerfed, but it's like a great example of people who do itemization not being on the same page as gameplay balance people because it was around for a month and it was almost impossible to die as a necro with it.