An avg. of ~$75 billion in govt funds are spent on homeless social services in the U.S. every year with very little results... that's ~$123k/yr for every individual homeless person.

Also, the problem with housing costs is that land is finite and expensive, hence the need for vertical growth and smaller units to add to the supply.

Finally, another problem is the influential, nativist NIMBY homeowners whom styme affordable housing efforts like vertical growth and microhomes to keep their property values high, while millions sleep rough on the street. The disenfranchised will stay screwed until they organize and demand minimal human decency.