I just started volunteering for a cold weather shelter last year and for the first time encountered people referring to the homeless as unhoused. I suppose it humanizes their situation, with “unhoused” seeming less stigmatic. For example, I suspect the image of a dirty, disheveled guy sleeping off cheap booze on a big city street is a lot of the first images to come to someone’s mind when they hear the word “homeless”, while “unhoused” is that poor family that got evicted due to loss of job/medical bills, et cetera.