Nobody mentions the subsidies because politics is reductive. That's my take at least. Even the more socialist (and crypto-socialist) people in politics and housing policy who care about these issues, that I've dealt with at least, acknowledge the need for increasing supply. The demand-siders (if I may) are mainly focused on getting better deals for their constituents when dealing with these cases. The fact that low % MIH is the standard doesn't mean that it has to or should be this way. Groups like City Life/Vida Urbana advocate for low income tenants from this standpoint and have for decades now.
That paper is fine and I generally like Evan Mast's work a lot, but it's just one side of the debate. You could as easily cite
this to substantiate the opposite (in bad-faith, imo). The debate has become so ideological in academia that I think we're getting dangerously close to a point where empirical analysis isn't going to matter in policy development. And it usually does. The housing policy folks I know are really plugged into these debates despite their living in the Ivory Tower.
This is the best faith description of the debate, imo, and I would hardly consider Been, Ellen, or O'Regan to be NIMBY partisans. In short, you need supply and demand-side reforms to happen in concert. Otherwise, urban policy concerning state-subsidized private development will continue to reproduce inequality in cities.
(I think all of these papers are accessible, but if not, I'll PM anybody the PDFs.)