I’m genuinely curious - have you or Celluloid ever heard the term “star system?” Have you read anything about the film industry in the 80s or 90s? Do you read the trade press, where the death of the movie star has been very widely discussed?
Yes, a few stars who can regularly open movies still exist. Tom Cruise is one. But there are far fewer then before 2000 and, more importantly, they are not the organizing principle of mainstream Hollywood filmmaking anymore. Films are built around IPs, not star personas. Robert Downey Jr AS IRON MAN is a big deal. It’s a successful marriage of actor and IP. It would be rare, however, for a modern studio to build a major non-IP film around Downeys star persona - that gets you The Judge or The Soloist. This is a major change from how pre-2000 Hollywood operated.
Studios used to organize their slate: Schwarzenegger action film - Julia Roberts rom-com - Ashley Judd woman-in-peril thriller. Now they organize it: Marvel film - Star Wars film -Avatar film. This is what posters on these boards complain about CONSTANTLY.