What the reason? It's simple - you can't build top team if u still changing something - it doesn't matter from where team is - Poland, France, Sweden or NA. It works the same everywhere. Only stabilizing, mutual trust gave you regular success.
And yes, agreed with you - Kinguin (D&G) still change someone and that's why they are shit as fuck - even that they have some really talented players like MICHU, Szpero or Furlan. But especially MICHU, let's be honest.
But idk why we talking about stabilization, it's not most important reason why i hate NV. I hate them, because i don;t like them, that's all. Meanwhille, i like guys from G2. Especially Shox - he is fucking god. No matter where he play atm - always show something good.