If people change their own preferences by repetition and practice, then they usually have a preference to do that. So it can be in their own best interests, for preferences they already have.
I could have a preference to change your preferences, and that could matter in the same way, but I don’t think I should say it’s in your best interests (at least not for the thought experiment in this post). It could be in my best interests, or for whatever other goal I have (possibly altruistic).
In my view, identity preservation is vague and degreed, a matter of how much you inherit from your past “self”, specifically how much of your memories and other dispositions.
Sorry for the late response.
If people change their own preferences by repetition and practice, then they usually have a preference to do that. So it can be in their own best interests, for preferences they already have.
I could have a preference to change your preferences, and that could matter in the same way, but I don’t think I should say it’s in your best interests (at least not for the thought experiment in this post). It could be in my best interests, or for whatever other goal I have (possibly altruistic).
In my view, identity preservation is vague and degreed, a matter of how much you inherit from your past “self”, specifically how much of your memories and other dispositions.