I would consider the ejector(a spring" and the other springs in a luger or any pistol to be consumable/expendable and require replacement at some interval, JMHO. Of course my opinion is based on my poor ability to make leaf springs, I've tried for over 50 years and they are tough to make under a shade tree.
To hear so many whine about breaking an extractor, you'd think that was the weakest link.
It is small and complicated, and occasionally breaks from internal flaws or misuse for sure; but it is actually pretty sturdy for its intended purpose.
If I had to pick a part or design flaw, it would be the small tab that holds the striker spring guide in the breech bolt and/or its recess. With a little(or maybe a lot) of thought it could have been designed or re-designed to have two tabs, and likely double the life of the assembly. JMHO.