Christine M. Korsgaard was kind enough to answer a few questions of mine. Here's an excerpt:
ERICH: I have the impression that some utilitarian philosophers are having an outsize impact on the world. I am thinking, for example, of Singer, Toby Ord, William MacAskill and Hilary Greaves who have been instrumental in founding the Effective Altruism movement, which is having a large impact on global poverty and health, factory farming and so on. Is this a correct observation, do you think? If so, is it something about utilitarianism that spurs concrete action of this sort? And does Kantianism not?
CHRISTINE: The idea of doing a lot of good has a lot of appeal. The Effective Altruism movement also appeals because of its focus on good you can do right now, and as an individual, at least as long as someone else is doing the complicated work of organizing the charity and distributing the proceeds effectively. The problem of global poverty requires a political solution; charity, no matter how extensive, can never be more than a band-aid. But it does have immediate results. I think utilitarianism has an advantage over Kantianism in the public sphere because it is, at least superficially, much easier to understand, and the theoretical problems with it that I described before are hard to see.
Thanks for the clarifications!
Maybe having valenced experiences means they have goods and bads, and not being able to pursue them makes them defective, regardless of what type of creature they are (e.g. if they were designed from scratch to lack the ability to pursue their ends)?
Aren't human infants pretty psychologically disconnected from their future rational selves, though? It's extremely rare for adult humans to retain memories from experiences in infancy, although I suppose experiences in infancy might still shape their adult personalities.
Are final goods also functional goods, though? It seems to me that our functions are also supposed to determine our final goods, not just that functional goods are instrumental. Or maybe they happen to coincide for humans? From the abstract of this paper of hers (assuming this is the view she is promoting generally, not just a specific defense of Aristotle):
This gets into modal personism/personhood. I have some objections to this and her responses to the argument from marginal cases in general, some coming from the literature on this topic (I think here and here, but it's been a while since I read those), but maybe they are based on misunderstandings, since my understanding is pretty shallow here: