Why is It Bad That I Only Want to Date a Woman Who's 99.9% Similar to Me?

I am asking this question because I am confused about why only wanting to date a woman who's 99.9% similar to me is considered narcissistic. Holding everything else equal, I'd rather be a bachelor than date a woman who's my polar opposite.

Why is It Bad That I Only Want to Date a Woman Who's 99.9% Similar to Me?
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