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Special:Export says "In the latter case you can also use a link, ..."
But it should go on to say how one can export more than one page via
just a (HTTP GET) URL, avoiding the POST altogether.

Say it right there regardless of if it is documented elsewhere e.g.,
on meta.

GET fetches support only a single input, at least by design.

Well there also is e.g.,
http://en.wikipedia.org/w/index.php?title=Special:Export&pages=USA%0D%0AUK&curonly=1&wpDownload=1
but that is not something most people could type with their browsers, so never mind.
(Picking two small (redirect) pages here so the example results stay sane.)