Barbie and Oppenheimer doing extremely well should tell you that nobody is interested in superhero movies.
I disagree that good stories would not sell it. Comics would not have been around that long without good stories. Things were getting a bit stale and then they came out with Black Panther and Deadpool and those sort of picked things up again, because they were different and fun. Once they found that formula that worked, they thought they could just slap a fresh can of paint and costumes on and it would continue to sell (ala Disney). Disney didn't invent this, but they could probably patent it lol. And like I said in the other thread, they also proved it only goes so far before people move on to something fresh.
Every version of Fantastic Four has been awful, so the new reboot during this less than stellar period was not looking promising.