And documents pretty much never break. I just re-LaTeXed a document I wrote in 1994. It worked, and it looked the same as it did back then.
That was not my experience. LaTeX changed rather massively between 2.09 and 2e; I found I had to make several changes to my dissertation (ca. 1995) to get it to "compile." And it sounds (or sounded, anyway) like 3.0 will/would be an even bigger break. Of course, these days my usage is limited to the occasional one-page letter, so I'm not terribly worried about future compatibility...
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