So because you didn't hear about any jp4 complaints nerfing it is out of the question? The thing disappears mid-fight at vet 1.
No, because you refuse to use the appropriate counters (double zis guns in your case) you demand a nerf where all other players learnt how to deal with this unit. It had always it's cloak ability just like the luchs.
Which decreases it's speed and doesn't work on close range, so drive a medium tank nearby, position some zis guns and force it by this out of cloak - go for the rear armour with your medium while exposing it to zis guns, taking it easily down like this.
Guys like you also complain that a KT gets destroyed when he charges tank destroyers with 60 range onwards.