I haven’t seen a single good argument why the eventual theory of everything should be local.
No love for the principle of relativity? It’s been real successful, and nonlocality means choosing a preferred reference frame. Even if the effects are non-observable, that implies immense contortions to jump through the hoops set by SR and GR, and reality being elegant seems to have worked so far. And sure, MWI may trample all over human uniqueness, but invoking human uniqueness didn’t lead to the great cosmological breakthroughs of the 20th century.
No love for the principle of relativity? It’s been real successful, and nonlocality means choosing a preferred reference frame. Even if the effects are non-observable, that implies immense contortions to jump through the hoops set by SR and GR, and reality being elegant seems to have worked so far. And sure, MWI may trample all over human uniqueness, but invoking human uniqueness didn’t lead to the great cosmological breakthroughs of the 20th century.