Yes, but that way, there's some accountability involved. The definition of social housing is clear. The cost is based on a portion of earnings. None of the other terms offer a clear, unequivocal definition of what the words “affordable” or “non-market” mean. There are different levels, and sometimes, that addresses a need.
Once again, however, we have to define exactly what it is. Affordable housing has no set definition. It sometimes comes as a surprise to learn what affordability really is. It's highly subjective and, as I was saying, housing is going to be affordable in 20 years. Right now, however, the people living there are struggling to put food on the table, and they don't want to wait 20 years. Any housing that someone keeps for 10 years will inevitably become affordable, but that's not what people want.