Regarding PCs & NPCs: My plan for handling the NPCs is pretty much as you said; if I end up needing multiple worlds, I’ll make sure the human players are distributed as close to evenly as possible.
Regarding the premise: Being better at interdimensional travel than at regular teleportation produces some weird incentives. Also, magic-users are generally understood to be crazy; “that mage is doing something unusual!” is about as concerning as “that fire is hot!”
Regarding PCs & NPCs: My plan for handling the NPCs is pretty much as you said; if I end up needing multiple worlds, I’ll make sure the human players are distributed as close to evenly as possible.
Regarding the premise: Being better at interdimensional travel than at regular teleportation produces some weird incentives. Also, magic-users are generally understood to be crazy; “that mage is doing something unusual!” is about as concerning as “that fire is hot!”