I gotta say I don't really get why ppl keep saying things like Zero Suit Samus was a sudden move to sexualize her character. Even in the Super Metroid days the director said she was supposed to look like Kim Basinger, who was a pretty popular actress in the 90's and kinda (IIRC) a sex symbol. I was a kid tho at the time.
IDK; Metroid has been my favorite series for a long time, and maybe it's just me but I've never really seen her character to be like Gwendolyine Christie's in GoT in her appearance or personality. I always just sort of thought her personality would be more like Ripley from the Alien franchise. The only thing I don't like about the Zero Suit designs is the heels because they don't make sense if she's got like this huge space suit on.
As for her height, the 6'3 quote was a mistranslation. That's her height wearing the suit; not without it.
https://www.nintendo.co.jp/n02/dmg/mea/samus/index.html
She's still really friggen tall in Smash though:
https://smashboards.com/threads/character-height-a-rough-start.402759/
So yeah, I think her out of suit height has probably always been around 5'8-5'11 ish. I can't see the suit adding more than 6 inches. Would kinda make sense since Basinger is around 5'8. And height doesn't necessarily imply masculinity or femininity anyways. Typing all this up makes me realize how cool it'd be to have a Hyrule Historia book for Metroid
I do though really hate the way they wrote her character in Other M THE BABY THE BABY. It'd be interesting to see how they'd adapt it, I'd really want them to lean heavy on the Alien influences. I really hope they do make a Metroid animation like Castlevania though, they really nailed Alucard's design in that.