In JL, Clark didn't save the world alone.
He needed Vic to separate the Mother Boxes.
While Clark was flying people out of danger Diana and Arthur kept Steppenwolf busy. Had they not been there, the New God would have just harried Clark, getting innocent people killed. And with Clark distracted Steppenwolf might've done better in the fight.
Bruce was useful too. I mean, I think he took down like, two parademons during the last fight.
All that said, the League could've divided up jobs and everyone could've gotten a slightly better showing......but after BvS I think we earned a chance to see Clark on top of the world.