Well, what is natural and where is the line?
We domisticated grazing animals since a while in large numbers, the smaller ones do produce something like a lawn. And soft grass is just really nice to play around with the kids. So I also simply keep bushes and tree spots for the leaves and insects.
It’s not really a complicated philosophical question.
Lawns aren’t native to your area. That type of grass didn’t evolve there, and it didn’t evolve to being trimmed short. That’s why it doesn’t produce seeds and why it’s killed by leaves.