I don't know if this is done to curb the spreading of ticks (and Lyme disease) in urban areas or to avoid "lowering your neighbour's properties value", but it's terrible for bio-diversity... Insects have it already pretty hard in cities and on top of that they've got nothing to eat in the tiny patch of grasses people call "gardens."
I'm with you on the dead ecosystem thing. Besides the vegetable patch, my garden is deliberately a happy self-regulated mess of grass and wild strawberries, trees and bushes, planted flowers and all sorts of plants and mushrooms. I only remove the thorns, and walk though with a scythe twice a year (one tough enough to cut the smaller saplings). It's quite rewarding to watch the birds, small mammals and amphibians that thrive there, and a delight for my young daughter. It is quite a surprise to hear that I'd have trouble doing that in the land of the free. Thank you for the insight !
9/10 you'll be fine, but knowing that, is it honestly worth doing?