"If the point is to promote Free Software, we do ourselves a disservice by making our Free Software work better on a proprietary system than a Free system. Let's include this support when it works on the Free platforms as well."

FSF is political, but only about Free Software. Their goal is to promote it, and I think RMS has shown very clear thinking in this regard. I don't love the decision/outcome (someone did work to make something better and it was rejected), but I get it in service of the larger goal.

To flip the pschology, you could imagine a world where Emacs did way more awesome stuff on Windows and Mac, and the ensuing HN discussion where the obvious snipe appears a dozen times: "lol they keep talking about free software but their own products work better on windows lol".