many of us I'm sure who have flower rich grass tracks and want to keep them that way. I'd certainly rather wander round my wood in the summer watching the butterflies on those flowers than see them replaced with stones
I agree, however having a firm surface underfoot doesn't necessarily mean you cant also have pleasant flowers on top.
25 years ago my 1/3rd of an acre travellers camp was abandoned and re-entry prevented, leaving bare scalpings. In the next 25 years it was colonized by pioneer species, willows, brambles, birch, Hazel, sycamore, creating a dense 'jungle'; so much so that when I bought it I had no idea it had been a flat clear area and that it was firm underneath. After removing the pioneer trees I was able to drive on it, and the only reason I didnt leave the 3" of leaf litter is there is glass among it which causes punctures, so some of it needed to be moved to one side. Where I have cleared it back to bare scalpings, its amazing how quick various plants are colonizing it, I'm having to strim it to prevent it reverting to jungle. Several of the pictures in my 'herbarium' are from the scalping-covered area, which is smothered in burdock, thistles, nightshade, ragwort, bindweed, woundwort, etc. Its firm 3" down, but the thin layer of soil is enough to support a carpet of flowers and is a magnet for butterflies. In the big butterfly weekend our scalping covered area was awash with Peacocks, Brimstones, Night Watchmen, Silver Fratillaries and numerous bees and Dragonflies.
Having a firm surface underneath doesn't preclude having wild flowers on top, nature will rapidly try to reclaim it. If the human race was wiped out by ebola or whatever, within 3 years Trafalgar Square and every motorway would be covered in grasses, buddleia, and a knee high mass of herbaceous growth.
Some good pictures here of nature reclaiming man-made areas to prove the point;