Champion's lives outside of rift and the other's

So in my belief, I feel as though it would be cool if it turns out that (at least the heroic/good) the champions not only fight each other for pastime fun but are also somewhat protectors of runeterra. they go to league, and when they're not battling they get sent out on missions to stop any sort of evil that threatens runeterra. I mean, after all, I feel like it would be a waste of their powers and abilities to just use them everyday to kill some random other champion that they probably have never seen before, just to see them be revived and possibly traumatized. surely they'd team up from time to time to defeat a new enemy.( besides each other....) wouldn't that be great?