I don't think your first statement is true. Most people I know or places I've lived in or been have a mixed, lived‑in garden where the lawn is one component of a wider ecosystem. Most don't look like the green on a golf course.
A lawn with clover, moss, daisies, micro‑wild patches, little plants I can't even name that drift in on the wind, and healthy soil full of ants and worms and beetles and spiders and things I need to photograph and identify is not a monoculture. It’s a low meadow kept short that hosts plenty of life.
Go take a look in any real garden or lawn for 10 minutes. You'll find life.