( let's say that this representation is true.)
I will use socionics references for convenience reasons. I think that if you have high dimensional Fi without it being in your Ignoring function then your Fi is sophisticated enough to tolerate others opinions and/or preferences. Therefore not everyone wants to think that their preferences are the best, for instance I love overcooked chips but I know that it's just me and I'm aware that some might love them too but most don't. We can say the same think about several aspects of life involving preferences of the self ("I") (sexual, culinar, musical , philosophical , political etc...). I think it's a matter of tolerance of the other's preference (just like the self) in all his or her complexity as an individual, as a human being. Of course Tolerance does not mean acceptance and we all know that one person's freedom ends where another's begins. We must not forget that we all need a healthy narcissism because it is constituent of our sense of self.
The Idea of killing the metaphysical Self obviously includes its narcissistic part, that reminds me what Nietzsche thought about the self when it holds Christian values even after the "death" of God. I think that he talked about the limitation of sentiments like compassion and that ultimately great achievements need great minds and great minds need an inflated Ego (narcissism). From that perspective killing the self is anti Nietzschean imho because It prevents the advent of the Ubermensch. Even if it's impossible to metaphorically speaking lobotomize a significant and constituent part of our psyche like the "self" without the certainty of losing the sense of self awareness I wonder what would be the implications of such a radical idea ? Ultra Communism ? Borgist assimilissiationism ? Anyway, sorry for the rambling (I'm not sure that I have correctly understood what you mean) and note that I don't know what I'm talking about !