I disagree with that post. There are many white males lead characters because they're the "default" characters. It's true in video games, it's true in movies, etc. When there's a black lead in a story, it's probably because the story has something to do with the fact that he's black. If he could be replaced with a white character without causing any consistency issue in the story, he will be.
It's part cultural (we're so used to seeing white male leads that we internally think white male when we think lead character) and part commercial (people are more receptive to stories featuring characters similar to them, so when you're selling your products to white guys, the producers will want your character to be a white male).
But the concern of not offending minorities is still interesting.
First of all, I don't think that having a woman be a lecherous drunk would be considered sexist. "Lecherous drunk" is not something that our culture associate with women. However, having a woman be a disturbed solider might cause trouble, since women are generally represented as less emotionally stable, so this would be reinforcing a negative stereotype of women. It would be like having a black lead character who steals televisions or mug people.
The fact that in the end, Elayne didn't need Guybrush is great because it subverts the trope of the knight in shining armor saving the damsel in distress. If you switch the genders, the joke isn't the same, and that's why it doesn't work as well.
I think it's also wrong to think that you can't have a flawed female character. In The Longuest Journey - and even more so in Dreamfall - April Ryan is a fragile character. Yet, nobody has ever said that these games were sexists. On the contrary, they're often shown as game with great female leads. Why is that? Because April Ryan and Zoe Castillo are well written characters. They're not stereotypes, they're characters with weaknesses and strong points and while their gender has an impact on who they are, it doesn't completely define them. And that's the kind of female lead that we need more of.