It's not a poor argument at all. The claim was: "And the notion that a garbage collector should ever be part of a game engine (or anywhere near it) is frankly baffling to me. .. unless you're making some turn based thing." But UE4 uses GC. One of the premium games engines uses the very thing that the post claims should never be used in a game engine. I have some sympathy for the idea that GC should at least be tightly controlled and that no-GC has its place. But to claim that GC should never be part of a game engine is simply contradicted by reality.