Jent,
My apologies; obsolete was a poor choice of words.
Archaic would have been a better choice of terms to describe the roller extraction system.
If clean and lubricated both designs are perfectly functional.
In my opinion the early design has a mechanical advantage while the later design has the advantage of simplicity and less machine work which was a significant consideration in an era where every additional machining operation increased production time.
Like you, I have no use for ejectors.