I appreciate your clarifications
I will try to explain this point, but mind you I'm pretty bad at writing... I hope I can get the meaning across.
This is a question of visibility. Of people feeling that they're part of the world.
It's the problem with "white-washing", non-caucasian people made to feel invisible and worthless because a main characters can't seem to be Asian/African/etc, only background characters.
That's why very often Gay Pride Parades take on the banner of "lesbian visibility". Everyone is so concentrated on the "struggle" of white middle-class gay men (because that's the group that typically has more power and visibility), that every other group is forgotten as if they're not important. The same if you're a man but you're not sexy and muscled.
Until recently the same happened with geeks and nerds. You'd only see the beautiful jocks and cheer leaders while geeks were ignored, unless you needed a stereotypical clever character. Luckily we're living the geek-chic period. We're stars now.
It's all part of the same process. All kinds of people exist. All are important and all should be embraced. No one should be made to feel unimportant.