I really doubt they're trolling, it's a real question. A person can clearly fit between the gaps and sleep.

It would block things like tents and mattresses, but it's reasonable [edit: even if ignorant] to ask how it works if it doesn't obstruct a sleeping person. For what it's worth, in my city, it's rare to see tents or even mattresses, usually just blankets and shopping carts.

Try sleeping on them and report back to us.

No need for that kind of talk, it's as pointless as saying "Go there and prove you can't sleep on them".