I'm not clear on what you're suggesting. Are you asking why I used my intuitive desiderata, as opposed to someone else's desiderata, or desiderata I picked out of a hat, or evitanda just to be contrary, or not seeking an ethical theory at all, or...? What's the salient alternative here that I'm meant to justify dismissing?
I'm asking why you decided that "choose the theory that best satisfies my intuitive desiderata" was the best method of choosing a theory. What justifies that method of "choosing a theory", if there is a justification and you did in fact think about it beforehand? If you did think about it, presumably you decided that was the best method of choosing a theory for some reason(s), and I'm asking what those reasons might be.
One alternative, for example, might be for me to critically analyze my intuitions beforehand and be skeptical that all ...
In You Provably Can't Trust Yourself, Eliezer tried to figured out why his audience didn't understand his meta-ethics sequence even after they had followed him through philosophy of language and quantum physics. Meta-ethics is my specialty, and I can't figure out what Eliezer's meta-ethical position is. And at least at this point, professionals like Robin Hanson and Toby Ord couldn't figure it out, either.
Part of the problem is that because Eliezer has gotten little value from professional philosophy, he writes about morality in a highly idiosyncratic way, using terms that would require reading hundreds of posts to understand. I might understand Eliezer's meta-ethics better if he would just cough up his positions on standard meta-ethical debates like cognitivism, motivation, the sources of normativity, moral epistemology, and so on. Nick Beckstead recently told me he thinks Eliezer's meta-ethical views are similar to those of Michael Smith, but I'm not seeing it.
If you think you can help me (and others) understand Eliezer's meta-ethical theory, please leave a comment!
Update: This comment by Richard Chappell made sense of Eliezer's meta-ethics for me.