Karyan has 3 consume charges with Zeal and is often used with Caranthir plus Deithlaff or Ruehin shenanigans yet I don’t see anyone calling for changes/nerfs. Unfortunately most people only ever cry foul when it’s Nilfgaard
That’s because there are plenty of counters for Kayran - and the cards you mention don’t touch the other side of the board.
(TIL: Caranthir/Kayran combo - I usually see Caranthir run with something like Living Armor or the Beast.)