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.
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.
If I say "I prefer not to be tortured more than you prefer a popsicle", any sane human would agree. This is the commonsense way in which utility can be compared between humans. Of course, it isn't perfect, but we could easily imagine ways to make it better, say by running some regression algorithms on brain-scans of humans desiring popsicles and humans desiring not-to-be-tortured, and extrapolating to other human minds. (That would still be imperfect, but we can make it arbitrarily good.)
This isn't just necessary if you're a utilitarian, it's necessary if your moral system in any way involves tradeoffs between humans' preferences, i.e. it's necessary for pretty much every human who's ever lived.