RichardKennaway comments on You cannot be mistaken about (not) wanting to wirehead - Less Wrong
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You also need the conditions of the utility theorem to hold. A preference ordering only gives you conditions 1 and 2 of the theorem as stated in the link.
Good point. I was effectively entirely leaving out the "mathematical" in "mathematical representation of preference ordering". As I stated it, you couldn't expect to aggregate utiles.
You can't aggregate utils; you can only take their weighted sums. You can aggregate changes in utils though.