Why Mon-El's Supergirl departure was necessary

TV Guide

"When you remove that love story from the equation, you get a clearer picture of why this story ended the way it did," says Lindsay MacDonald. "Mon-El had established a life in another time (seven years there versus the few months he had on Earth), and that story was consistent with the comics that placed his character in the Legion of Superheroes. The show has deviated from the comics often enough that doing so in this instance wouldn't have been out of the question, but I'm honestly glad it didn't."