In this case, you are saying that the old run (w/ "Demon in the Bottle") has faded more.Is "Demon in a Bottle" still defining? Because the Iron Man of the movies did well enough without adapting it. It did borrow more ideas from Ellis' Extremis Run and other concepts.
But, "Iron Man has a drinking problem" has been a thing for so long that even the jokes got old years ago. The references and understanding are just sort of there.
The longer a series runs for, the more chances it has to have defining moments. (This is why it is so difficult to accept that Peter Parker is, at most, only 30.)So what do you for a character who had defining moments in multiple eras and multiple ages and stages? How do you decide which happened when? In the case of the X-Men,obviously the Claremont run is defining, moreso than the earlier eras. In the case of Fantastic Four, the Lee-Kirby run, then the John Byrne run, and I guess the Jonathan Hickman run are defining. But Spider-Man has been unusually rich in terms of periods.
And, before one of us trips over an obvious problem, we should agree that "defining" is not the same as "good".
Hickman's run on "Avengers" is excellent. But, it is a significant deviation in tone from most of Marvel, and the Avengers specifically. That is not defining. In contrast, Gruenwald's run on "Captain America" was defining, at least until Brubaker's run. But, it did not age well. (Truthfully, it was retrograde when it was published in the 80s.)
If we assume "world outside your window", then we should accept that something published more than a decade ago (if not even less) is no long relevant. (Try selling that idea to fans. It will be a wasted effort.)And you know DC everything is set in fake cities with little ties to real places and history. But Marvel has always been "the world outside your window" and that means that timeline will always be an ongoing problem.
"Showed up on a cartoon and was described as...." is an easier sell than "travelling sideways through time and unwittingly co-exists with....re-incarnated space cop....ruled Egypt....no the other Golden Age one...."And today, the only Hawk character people care about is Hawkgirl. A character that originated as his love interest, and then made into his superhero partner, and ultimately overshadowed her boyfriend.