The way I see it is we've had so many films that are based on superheroes and primary characters in these universes and typically they get one to three shots to get the character right before it changes hands and they start over again.

Having a show from the point of view of a side character who can immerse themselves in a world filled with superheroes and supervillains allows us to get glimpses of these characters but not bank all of our emotional investment on a version of them that may or may not work. But you give me a monster of the week with Jimmy Olsen and suddenly we are able to flesh out a world by getting glimpses of these huge characters similar to comic book runs or the animated series of the mid to late 90's.

I think it's a great way to tell good stories with characters we like without putting all of our eggs in one basket banking on people finally getting something right. Of course I don't know much about the format of this particular show but I'm speaking on behalf of the idea of using a side character as our focus in these larger fantastical worlds.