Pulp Fiction, Killing Zoe and Trainspotting were critical darlings back then and would still be today, but they weren’t even all watched back then - Killing Zoe was not very successful. I don’t think the way movies are reviewed has changed a lot since then.
As far as independent movies have changed, I think that’s more down to the movie industry than to critics.
Again, I am wondering where you’re getting that from. To give a snipping of the movies coming out right now:
I don’t think Ralph Breaks the Internet, Creed II, or Instant Family were made by David Lynch. Although I would love an Into the Spiderverse movie by David Cronenberg.
Outside of a brief phase in the seventies when Taxi Driver and Apocalypse Now won the Palme d’Or, they never were.