Following the Proven Path?

This entire thought process flies in the face of what the Berlanti group usually does with their superhero projects.  In both “The Flash” and “Arrow,” the main characters started off against some lesser-known and weaker villain types prior to meeting their arch-nemesis in battle.

Oliver Queen starts off against a swindling businessman and his army of thugs, and a few hired guns that are supposed to question him about his time on the island.  Grant Gustin’s Flash character gets to go against a fairly tame meta-human and then saves a guy on a bad bike ride.

Supergirl however, doesn’t get a preliminary undercard bout right off the bat.  Kara Danvers is going to decide to embrace her superpowers, find a costume, and battle one of DC’s bigger villains all in the first episode before the critics have even had a chance to sharpen their pencils.

Why are they doing this?