I'm not sure that the original question can be answered properly ... times change, and all of a sudden, what made something important in 1970, is totally and completely incomprehensible in 2020. Not to mention that a lot of posters will ignore the history behind it, and the litter that the film, or whatever part of it, created.

In the 50's and 60's in Europe, the Vatican had a big mouth and they made a lot of films much more famous than they probably would have been without a word being said ... and of course, the same religious group ended up making DT one of the most famous films ... not only was it selling at the theater ... everyone went to see it with a funny hat on ... but it helped start the video craze ... all of a sudden video recorders and videos were available ... and guess what sold the most? 

Compare that to nowadays, when the media exposure is about the quantity of money they have invested in the film, and you know that whatever is ... this or that ... will be ignored in favor of some "action" or some other far out this or that that makes it pink, and better than a cartoon!

But a lot of films, are remembered time and time again ... and the only issue I have with it is that the ability to SAVE and make these things available is diminishing, even as some films that should have been available, are still controlled, and expensive.

A lot of things I like ... 

Orson Welles's Chimes at Midnight ... is continually dismissed because of a stuck up Shakespearean bunch of idiots that can not fathom a world that is not as pretty, clean, and romantic as their notion is of the bard and its characters. Never mind that "The Globe" didn't even have enough latrines for its public ... specially as those might have been specially saved for the upper class!

Luis Bunuel, made a lot of fun of the religious orders ... they say something about graven images, and continuously stand by them and pretend that those images are the real representative of the whole ... idea! For this, he created many stories that upset the clergy, even though a Dominican Friar and close friend to Luis always said ... he just challenges your ideas and beliefs! So in one film you get a picture of Jesus laughing. In another you see the greatest array of foul mouth terms, to someone in atop a pillar. And then, you get a supper. And if that is not enough, you get a group in a later film setting up explosives under his name! ... best we ignore all that non-sense, right?

There are some films in American History, that I think deserve some more attention ... and at times, I think they were vilified for the wrong thing. "The Wild Bunch" is a very interesting film, and no doubt one of the most incredible spectacle ... but we continuously dislike the end of the film ... which was almost the same thing as the start of the film ... kids playing and killing scorpions with sticks and fire! Guess what the adults did in the end? The irony and accusing finger ... becomes a bizarre adventure that made him glorify some violence, in various directions after that film! And in my book, some of the stuff he did AFTER just was not that good, and was built around the expectation of some glorified violence, which to me, was just like the opening of the horror film and its gore ... bloodier ... and of course now it's in color and we can really see it better, like we need to!