I think restricting ourselves to one specific genre doesn't help.
Comedies were more clever 70 years ago than they are today for the most part. That doesn't mean that there aren't clever comedies today, and there weren't dumb ones back then. On average, however, today is lower than it was then. Same thing with pretty much any genre or subgenre.
The only thing that has really improved are special effects, which allowed to do things that you weren't able to do back then.
And yet, find me a single thriller in the last 25 years that is more nailbiting, intelligent and impressive than Hitchcock's Rope.
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I know classic, pre-60s era Hollywood has a big following, but for me personally live action filmmaking doesn't start to get really interesting until 2001: A Space Odyssey.
I'm not saying you're wrong, just that those are my tastes, I've been meaning to see more classic cinema, Hitchcock is definitely impressive from what I've seen.
But focusing on just the last 54 years of cinema, we go from 2001: A Space Odyssey, Jaws, Close Encounters, the original Star Wars trilogy, Alien, Blade Runner and Raiders of The Lost Ark to... Armageddon, The Day After Tomorrow, Transformers and now the Woke era of Marvel and Star Wars? That's a pretty clear line of de-evolution, from brilliant, to dumb, to actively hateful and repellent, even dumb becomes preferable.
That's because, unlike in previous generations, we entered a mood for 'If 1 is good, two is better! Like a big mac? Here's a double big mac? Like Jurassic Park? How about Jurassic Worlds!' Spiderman? How about THREEEEEEEE SPIDERMAN?!?!
People are happy with that slop, it makes profits, so bigger = better and that's why you don't see movies with medium budgets anymore, it's either indie shit or 150m+ juggernauts.
Indeed, that's a big part of today's problem, we never show any restraint, it's always bigger and bigger, but there comes a point where if everything is big, nothing is.
The Back To The Future trilogy stands out because Marty's adventures are much more small scale compared to say cities being destroyed, but that's precisely what makes them particularly exciting.