It's been kept off the market by "rights issues" (which seem to be directly linked to the remake, as those issues haven't affected the other films Romero did for Laurel).
The reputation of the Snyder film has greatly benefitted from most modern viewers being unable to directly compare the two.

Hey, that's the same advice Frank Miller gives!

WATCHMEN is derided by everyone who actually read the damn book.

(Snyder’s widely derided 2009 adaptation of the canonical graphic novel Watchmen gets rightly criticized for missing the nuances of the book, but it doesn’t get enough credit for its fight scenes, which are really something.)
Perhaps because they're one of the biggest examples of Snyder not understanding the source…

Del Chimney? Boy, this really DOES go back to the early days. Did we just get a clue as to who murdered him?

Punk rock? You mean that briefly vital music movement from the 1970s that by the 1980s was already a self parody desperately trying to cash in on a fantasy of how "edgy" it was?
Because given that's what punk rock actually was, "X is punk rock!" is a pretty useful metaphor for a LOT of things.

We live in a world of DVDs and streaming. "what time is that show broadcast at?" is meaningless.

George A. Romero was to horror what George Lucas was to Sci-Fi: each made a film that totally changed their genre… and then both Georges spent the rest of their careers dealing with the fall-out.
(Lucas had the better business sense, of course.)
But when a creator does hit on that big, defining moment so early on, the…

AT&T?
You mean… THE PHONE COMPANY?!
https://www.youtube.com/wat…

oh right, like David Brooks would associate with anyone out of his tax bracket.

He's a full-fledged genre icon, from fan favorites like the Apes films and LEGEND OF HELL HOUSE through to being the only guy to have played a Bat-villain on both the Adam West series and BTAS.

Stone's original CONAN script took place in the future.
It's as if he just looks at Ah-nuld and goes "TIME AND SPACE ARE WITHOUT MEANING"

Studio Exec 1: We don't want the remake to be as politically charged as the original series.
Burton: What's a "poleet-e-collie"?

oh, you mean this?
https://durnmoosemovies.wor…

Michael Gough was a special delight for those of us who grew up on his campy horror movie villains. https://www.youtube.com/wat…

Yeah, but she was playing her during the "New 52" period of the comics, where some idiots decided she needed to be young and sexy.
Fortunately, Comics Waller is back to normal, and other media have quickly followed suit.

Actually, casting-wise, she's had a pretty good run in her live action incarnations- Pam Grier, Angela Bassett, and Viola Davis).
I think she may be the new Alfred Pennyworth- that character off to the side who doesn't have to worry too much about being miscast.

They were much better known to the general public then, too!

She had that secret weapon of casting actors who clearly could have played the characters in live action, if it had been made a few years earlier.

Yeah, i love it, but not because it's a brilliant dramatic scenario. I love it because they let a madman director and his cinematrographer just go on a self-indulgent rampage.