What Hollywood "lost" in recent decades wasn't indie/small budget/experimental/weird cinema, but "the middle budget", the romcoms and "family movies" and expensive ensemble comedy movies and oscar-bait dramas with lots of bankable stars doing silly or dramatic things on less than a blockbuster budget but more than an indie. But the indie world is filling in a lot of those gaps, and the direct to streaming "original" world is filling in more of those, and signs are some of those budgets are coming back (Heart of the Beast is an example of that sort of lost mid-budget film that just released to theaters).
You may not like superhero budgets, but they are not what killed "weirder indie shit". If anything they seem to be supporting it. Superheroes killed the mid-budget because they could play many of the mid-budget genres such as "family movie", comedy, and romance, and sometimes even "serious" drama.
(ETA: The Big Lebowski is a fun example because that was an indie budget film and the closest the Coens came to the mid-budget was The Hudsucker Proxy which needed it for all the period piece work. Budget size doesn't necessarily equal quality, though I remain a fan of The Hudsucker Proxy it did poorly in the box office and is often considered one of the worst films from the Coens. Ethan Coen directed Honey Don't and Drive-Away Dolls in recent years which were both excellent. The Coens haven't disappeared, though they've shifted gears a bit.)