Gavin, I understand the FSF's position. Even though I am actually wearing a FSF thirty today, I disagree with their stance that other open source license are not useful. Really, it is up to creators to license code the way they want to.
They don't have any such position, at least not so absolutist. In fact, that was the whole point behind LGPL, to bridge the gap between GPL and BSD licensing. RMS also approved of the Ogg Vorbis library using the BSD License.
They do make exceptions when there is strategic sense.
> I disagree with their stance that other open source license are not useful
There are two inaccuracies with this statement:
1) The FSF does not disapprove of the use of non-copyleft free licenses. They encourage the GPL, but as pointed out below, they themselves have both released code under other licenses and approved of the use of other licenses.
2) You seem to have missed gavinpc's point, which is that the FSF is the Free Software Foundation, not the "Open Source Software Foundation". They don't say that "other open source licenses" aren't useful, because they don't refer to their own licenses as "open source" licenses. They dislike the term "open source" and don't use it themselves.
Yes, only FSF doesn't use the term "open source," except to disavow it.
https://www.gnu.org/philosophy/free-software-for-freedom.htm...
Another explanation of this is included in the "rider" that someone linked earlier this week:
https://news.ycombinator.com/item?id=7754412