Fair point... I think the way I see it is that Bentham discovered the core concept of utilitarianism and didn't build quite the right structure around it. My intention is to make ethical/metaethical claims, not historical/semantic ones... does that make sense?

(It's true I haven't offered a detailed counterargument to anyone who actually supports the maximizing version; I'm assuming in this discussion that its demandingness disqualifies it)