@Death Usagi According to supplemental material, in the novelization of CCA she was pregnant with Amuro's child during the Second Neo Zeon War when he crossed "over the rainbow" after using his own and Char's lifeforce to push Axis with the psychoframe
It's just Yoshiyuki Tomino though not 1980 anime as a whole. He only focus on tragic and political story side of things, and people die a lot in his Anime (think IDEON) and therefore romance is not really his thing.