I'll say I didn't really follow the whole gamergate thing (little blurbs here and there) so I don't fully know what it is about, but based on the op quotes, I don't think every game has to be made for everyone.
Historically, I have never been a fan of difficult games (though I am shifting a bit on that) but I don't think that every game needs to have difficulty options or whatever. For instance, the point of a Souls game (from what I hear - haven't played one) IS overcoming the challenge. Everyone has their own kind of fun.
I mean, I don't like some genres but I don't think every game needs to to my taste. A horror game need not have a non-horror mode just because I don't like fear in games.
Regarding this quote:
"No, Im not blaming the developer for my own shortcomings. I respect the designers, even if I didnt truly understand at first the games theyve made. I would just like to make sure that they make their games for people who are new, or noobs, as well as hardcore fans. As Nolan Bushnell, cofounder of Atari, said, games should be easy to learn and hard to master. (Yes, I know Cupheads tutorial isnt that hard to learn)."
A super easy Darks Soul as I understand it would be defeating the point of the game's existence.
In general, a challenge forces you to become better at a game allowing you to enjoy a game at a whole new level or if you prefer a whole new way. Interestingly, this is something the 'easy' modes of games like The Witcher 2 and Max Payne 3 taught me (not that I have suddenly become a fan of super difficulty).
My overall point is that things needs not be homogenised to just a few tastes.
Some people complain about lack of gender or lack of race. While I think these are important issues I don't think every game needs to have a character creator to the degree of Fallout, Mass Effect, Dragon Age etc. I mean these sorts of games are great and are generally my preference. However, sometimes I just want the tale of Geralt of Rivia or Master Chief and Cortana or Lara Croft.
Personally, my preference is interactive/dialogue-tree storytelling (Kotor, The Witcher, Mass Effect, older Final Fantasy games to a degree) but I know know some prefer the cutscene stylings of Uncharted or Metal Gear or others the full immersion of Half Life and Portal.
I don't really know what gamergate is about but these are my thoughts on these issues.