This question was closed for Game Design and Development. But to me it seems on-topic.
As a DotA2 player the term used is correct and is asking about a mechanic:
Why don't Desolator and Mask of Madness stack?
They got an answer about the mechanic and OP accepted it, but later the question got a comment and was closed.
As someone who doesn't really use Arqade I wanted to know how it was 'speculative about developer intent'. And how I would not ask a mechanic question that is off-topic for the same reason(s).
I also done a quick search of 'Game Design and Development' meta questions and would assume it to be on-topic, but that was a while back and may have changed. (My ability to search is bad)