Yeah that's why this was my idea, this is a way to tell gender with a very quick and easy change and without needing to make new graphics/alter the UI/consider mods. At the very least as a stopgap until then.
Otherwise, my other idea would be to show the unit's paperdoll in the armor equip window that pops up when you click the button.
I'd also be fine with shortening the stat bars and putting the paperdoll on the right/left, but that's a more drastic alteration.
Uh... That would be... silly. We can tell them apart already by sprite, why make it part of the UI? After all it doesn't matter, game-wise.
The problem is you can't see the sprite from the soldier base menu stats screen, which is the only place to rename soldiers. The info is important for those who like to rename their soldiers (to avoid giving a female a male name and vice versa)
The pink/blue duality is mostly a thing of the American culture, and XCom is supposed to be global... Is this a flamebait, Sir?
No, it's merely a fairly standard convention with no connotation intended. If it seriously bothers you, feel free to think of different colors or a different idea.