exactly, a good awper provides so much stability to teams. The most powerful gun in the game needs an user who can exert control in a map just by being there. While I think Amanek does not deserve to get cut, but he clearly is not good enough awper. But cutting him for an awper might not be a bad thing. Jackz is not getting a free pass either, but he plays dog roles and positions, so cutting him is not really the easy decision either.
IMO nexa has not really been consistent enough in G2, he needs to step up a lot or get cut. He has some of the best players in the world, I would expect more than he is delivering now. I agree he can be good, but we have not seen much of it lately. Who would even replace him? NiKo can't IGL, so they have to get someone from the outside.