Look at how Optic, Fnatic, FPX struggle when they're in a 4v5 most rounds. having a solid igl over player worked, but it's slowly going more towards mechanical players. Saadhak the igl for loud, is a demon. guy performs well, and igls well. Stax on drx, performs well, and igls well.
They're the future of what igls standards for mechanical play would be.
Zander performs well, and can igl. It's more down to if a team sees a player being 50/50 with igl/performing, or 70/30, etc.
This is all my personal opinion aswell. Just I can see the fading out of pure igls, and more of a focus on a hybrid igl/mechanical player.