I told my girlfriend of 4 years that there are three things that, if taken or limited, would result in my leaving the relationship. Motorcycles, guns, and guitar... leave me those and we're good!
That is certainly part of the equation as well. I had read (consistently from those who had issues) the ejector still had little tool marks (or mold marks) on the edges and that this was easily corrected with at least the extractor if not that AND the ejector. Regardless, parts are cheap and it...
The new gen 4s (and gen 3s since they share parts) have had some ejection issues. Replace extractor with the proper model and you will eliminate that problem (unless it is operator error like limp wristing).
It sucks, scares people away from glocks. Fortunately I got my glock 19 before the gen...