It's because they're nepo babies. Nepo babies are the logical actor extension of sequels churning and critical viewers are tired of recycled content. I think movies are becoming more like packaged goods, not just in stories but also the actors, and studios are fine with becoming more like McDonalds because McD's makes a fuckton of money.
Are you saying that the current generation of Hollywood stars are generally nepo babies? I’m not saying it’s not true, but Tom Holland and Timothee Chalamet are not good examples for that.