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>A problem with this whole discussion is that "homeless" means people that are sleeping at friends' houses etc, but to the average citizen when they're complaining about quality of life issues caused by the homeless they are referring to the subset of homeless people that are "unsheltered".

This point is addressed in the article:

> The stories and data in this essay show the missing link between homelessness and housing costs: people without money who avoid becoming homeless do so mostly by staying with others, usually their own parents. This happens outside the formal housing market. But parents’ and others’ ability to offer space is limited by what they can afford in the market. Where housing costs are moderate, friends and family have bigger homes. When they are higher, friends and family don’t have space to share, and this is often what puts a vulnerable person onto the streets.