I still don't know what you mean by 'restrictions on creativity' - what restrictions on creativity, specifically? Can you offer some concrete examples?
It deserves its own thread and I could talk for days about it. Endless examples.
The reason I draw a connection to the past is because those publishing companies that Lovecraft and Capote said were restricting content decades ago, they eventually got absorbed into other companies and those companies got smaller and smaller in ownership. If you check the big 5 or 6 multi-national media companies now-- they usually fired staff when they merged and the decisions fall into fewer hands.
I think that would mean less chances for variety than before.
That is certainly what happened with film as the companies merged.
Publishing did undergo something similar---when Harry Potter came along, they started to stock entire shelves with it--and used the blockbuster expression as has been used in film (and in stage theater before that). The idea was that people wanted
more of less. So, if you were a science fiction fan, you did not want the choice of 10 different sci-fi movies, you only wanted to watch Star Wars 10 times instead. Supposedly.
There was more talk of Harry Potter and less room for other voices. We were told this was all due to public demand and had nothing to do with corporate-engineered marketing and distribution control. "India loves Harry Potter!"
As for examples, in Dracula, Sherlock Holmes, and Conan, there are strong successful male heterosexual characters who are able to problem solve without outside dependency--there may be a collaboration but it doesn't make the protagonist look weak or dependent. There's also a separation between the value of home and the foreign.
The foreign is dangerous and you have to be careful with it. That's an ancient story point. You find that in classical works that are still read today.
In the case of Dracula, we have men from a specific place (and a couple of exotics from the US and Holland?) they come together and defeat a scheming foreigner who seeks to prey on women and children (thank goodness it's fantasy).
With Conan, in a story like Tower of the Elephant, he encounters an alien captive-and he makes a deal to free/kill the creature--not to become his mentor, or his sidekick, or his president, or his marital partner--but to go off-presumably back home. There's a separation line between home and the foreign.
Sherlock Holmes has that too.
The emphasis is also on natural-born ability. The strength and courage of the men in Dracula, the brain of Sherlock Holmes, the natural powers of Conan.
Harry Potter is different. For one thing he is a wizard. That is outside of natural abilities. His adopted home is rejected. Those awful muggles. He is better off in a foreign land, surrounded by strangers from other places, and he is reliant on magical powers and the help of his companions and many mentors. He is supposed to be a savior but does he really demonstrate heroic traits?
It sure doesn't sound like a traditional characterization.
So if I am wrong on the restrictive trends in theme and character, then suggest one that seems like it could have been written in 1930 or 1900 and was published recently by a traditional publisher and the author doesn't have any biographical eccentricities that may serve as virtue signaling advert fodder.
I WILL scrutinize it in detail.
Beware.