Would you prefer to have a road/more dense urban space/a parking garage?
I agree with you in that I wouldn't find my own personal lawn satisfying, but lawns are not nearly the worst option. Humans need outdoor space - the lawn also benefits people passing by.
More dense urban space, yes. Once you increase the housing density you can have walkable/cycleable cities and decent public transport rather than urban sprawl.
I'm in favour of open, green spaces for people to play or relax, but that doesn't happen on lawns; public parks (at least as implemented here in Europe) offer much more chance for everyone to enjoy, and socially rather than on their own.
I agree with you in that I wouldn't find my own personal lawn satisfying, but lawns are not nearly the worst option. Humans need outdoor space - the lawn also benefits people passing by.