As this is also in the books, I wonder if it might possibly stem from Tolkien's own beliefs on burial? Cremation in the modern sense is still resisted by many in the UK who hold strong Christian, particularly Catholic faith; historically at the end of the Victorian era it was seen as very peculiar indeed to opt for a cremation. I think this has something to do with the body needing to be 'intact' at the Day of Judgement.
Cremation was also at one time commonly used among the pre-Christian culture in the British Isles, particularly in the centuries leading up to the Roman occupation. Maybe Tolkien was making reference to cremation being of an older culture in light of this. Perhaps...though I've never read anything to confirm Tolkien's own views on the 'proper' conduct for a burial rite...
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Gordon's alive!
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