But deciding to use utility functions that will [...] seems to be rational.
You can’t decide your utility function. It’s a given. You can only make decisions based on preference that, probably, can be represented in part as a utility function. Deciding to use a particular utility function (that doesn’t happen to be exactly the one representing your own preference) constitutes throwing away your humanity and replacing it with whatever the new utility function says.
You can’t decide your utility function. It’s a given. You can only make decisions based on preference that, probably, can be represented in part as a utility function. Deciding to use a particular utility function (that doesn’t happen to be exactly the one representing your own preference) constitutes throwing away your humanity and replacing it with whatever the new utility function says.
Okay. Substitute “Maximizing your expected utility” instead.