Question about darkness, faerie fire, and blinded (re: (dis)advantage)

People are busy making the error of the converse. "Opaque objects block darkness" does not mean "non-opaque objects do not block darkness", and in fact opaque things that do not count as a barrier and thus do not provide total cover (such as a cloth) can block the spell.

What you can say about darkness is "the developers don't understand standard terminology for vision". Seriously, anyone who understood what they were doing would have solved this problem by making darkness and heavily obscured different effects. Since they have not done so, we have no way of telling what the darkness spell actually does.