Also there is no way to compare interpersonal utility. There is a sense in which I might prefer A to B, but there is no sense in which I can prefer A more than you prefer B. We could vote, or bid money but neither of these results in a satisfactory ethical theory.
Perhaps not with utility theory's usual definition of "prefer", but in practice there is a commonsense way in which I can prefer A more than you prefer B, since we're both humans with almost identical brain architecture.
Interesting, so your utilitarianism depends on agents having similar minds, it doesn't try to a be a universal ethical theory for sapient beings.
What exactly is that way in which you can prefer something more than I can? It is not common sense to me, unless you are talking about hedonic utilitarianism. Are you using intensity of desire or intensity of satisfaction as a criteria? Neither one seems satisfactory. People's preferences do not always (or even mostly) align with either. I suppose what I'm asking is for you to provide a systematic way of comparing interpersonal utility.
As per a recent comment this thread is meant to voice contrarian opinions, that is anything this community tends not to agree with. Thus I ask you to post your contrarian views and upvote anything you do not agree with based on personal beliefs. Spam and trolling still needs to be downvoted.