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If you want to argue an alignment proposal "breaks after enough optimization pressure", you should give a concrete example in which the breaking happens (or at least internally check to make sure you can give one). I perceive people as saying "breaks under optimization pressure" in scenarios where it doesn't even make sense.
For example, if I get smarter, would I stop loving my family because I applied too much optimization pressure to my own values? I think not.
Something that confuses me about your example's relevance is that it's like almost the unique case where it's [[really directly] impossible] to succumb to optimization pressure, at least conditional on what's good = something like coherent extrapolated volition. That is, under (my understanding of) a view of metaethics common in these corners, what's good just is what a smarter version of you would extrapolate your intuitions/[basic principles] to, or something along these lines. And so this is almost definitionally almost the unique situation that we'd expect could only move you closer to better fulfilling your values, i.e. nothing could break for any reason, and in particular not break under optimization pressure (where breaking is measured w.r.t. what's good). And being straightforwardly tautologically true would make it a not very interesting example.
editorial remark: I realized after writing the two paragraphs below that they probably do not move one much on the main thesis of your post, at least conditional on already having read Ege Erdil's doubts about your example (except insofar as someone wants to defer to opinions of others or my opinion in particular), but I decided to post anyway in large part since these family matters might be a topic of independent interest for some:
I would bet that at least 25% of people would stop loving their (current) family in <5 years (i.e. not love them much beyond how much they presently love a generic acquaintance) if they got +30 IQ. That said, I don't claim the main case of this happening is because of applying too much optimization pressure to one's values, at least not in a way that's unaligned with what's good -- I just think it's likely to be the good thing to do (or like, part of all the close-to-optimal packages of actions, or etc.). So I'm not explicitly disagreeing with the last sentence of your comment, but I'm disagreeing with the possible implicit justification of the sentence that goes through ["I would st
Oops I realized that the argument given in the last paragraph of my previous comment applies to people maximizing their personal welfare or being totally altruistic or totally altruistic wrt some large group or some combination of these options, but maybe not so much to people who are e.g. genuinely maximizing the sum of their family members' personal welfares, but this last case might well be entailed by what you mean by "love", so maybe I missed the point earlier. In the latter case, it seems likely that an IQ boost would keep many parts of love in tact ... (read more)
This seems more likely than you might imagine to me. Not certain or not even an event of very high probability, but probable enough that you should take it into consideration.