I get it. It makes sense.
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Personally, it's not for me, since
(1) I just don't like being gutter-to-gutter crowded. If I had my way, I'd see nothing but grass and tree, with not a single neighbor in a straight line of sight.
(2) I like entertaining family/friends in the intimate setting of kitchen/backyard rather than a public park.
(3) A park lacks certain things, e.g. a trampoline, which my kids love.
(4) My young children (ages 1, 3, 5) can't yet go to the park independently, even a nearby one, but they can open the back door to the fenced background.
(5) Same as #4 but pets (dogs, ducks, chickens).