True. I haven't noticed an accuracy difference that can be attributed to extractor setup. However, I have noticed that push feeds with spring loaded ejectors are much more forgiving of a headspace uniformity problems, as well as other non-uniform variables.
In those instances, the extractor or controlled round feed setup is not directly responsible... but the fact that there often isn't any spring loaded ejector to accompany them, is the variable that matters. However, that too is only compounding the actual problem, which is the users inability to control the dimensional uniformity and dimensional accuracy of their ammo.
So it's a question of forgiveness, rather than a directly attributable trait.
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