I like the idea of a floorless tent, but in the buggy areas I camp in I don't see it as practical. Plus in every photo I've seen of them set up, there is a significant gap at the bottom and I camp in tree less alpine areas that often have pretty good winds and it just looks like the wind would come right in, which isn't a problem with my Fly Creek because the inner walls come up pretty high.
So far as cleaning a regular fully enclosed tent, I just un-stake it, crawl in, leave my feet outside and stand up, raising the tent over my head. And shake. All the the debris falls right out the door. Then I set it down, and dismantle it and put it away. No setting up at home or sweeping required.