I would wager that the majority of people posting about lawns that require maintenance don't actually own a home with one or are forced to do said maintenance by their parents.
The native plants that can grow in my lawn are not appealing so if I were to just let it go wild I would have a shitty looking, pest riddled, brown, half-dirt/half sticker mess that my kids can't play on. We have beds where we can make them work but I do not have the time, money, or inclination to make it fence to fence flora. Also the most common bugs we get are mosquitoes and I would rather not encourage them any more.