It isn't fixed like English, but parts of it are indeed fixed, prepositions being one of them. The issue isn't that putting a preposition at the end of a sentence in Latin gives the preposition undue emphasis, but rather that you simply can't put a preposition at the end of a sentence in Latin[1]. Ending an English sentence with an article would be roughly similar in terms of nonsensicality. As for Joyce, well, you know he's binomeans to be comprendered!
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< Latin word order isn't fixed like English
It isn't fixed like English, but parts of it are indeed fixed, prepositions being one of them. The issue isn't that putting a preposition at the end of a sentence in Latin gives the preposition undue emphasis, but rather that you simply can't put a preposition at the end of a sentence in Latin[1]. Ending an English sentence with an article would be roughly similar in terms of nonsensicality. As for Joyce, well, you know he's binomeans to be comprendered!
1. It's the same with split infinitives, which you just can't do in Latin short of tmesis (http://en.wikipedia.org/wiki/Tmesis#Latin).