I take it you've never been to a playground taken over by the homeless and drug addicts? Had to wash down the the sidewalk at 5AM in the morning so people don't step in filth walking into the office or store?

I don't see anything wrong with hostile architecture, per se. What's wrong is hostile architecture in the absence of shelters and housing programs. But the solution isn't giving over playgrounds and store fronts, but to provide housing.

And as someone who has lived in multiple large cities, I've seen firsthand (as an observer, as an acquaintance) a not insubstantial fraction of homeless will simply refuse assistance, whether because of mental problems or drug addiction. So the presence of hostile architecture doesn't necessarily mean shelter doesn't exist, it simply reflects other societal ills.