Comment by bregma

But where I live there are larges areas of native grass that evolved to being trimmed short by grazers, spreading eagerly through rhizomes as a survival trait because of frequent brush fires. It gets killed by leaves every spring and spreads back by the fall but after a burn the trees are gone and its one of the early succession pioneers. A maintained lawn is just holding a post-burn condition in stasis.

Simplistic answers really work best when things are complicated philosophical questions.