I will be getting this game soon and I also plan to go down the dark wizard path. I want to experience how much things change by being someone evil and learning all those curses. I didn't know there were gay and trans wizards in this game, I think it's kind of weird, but it's like you mention, that doesn't have to detract from the game's potential, anyone who doesn't play it because of that is missing out. I hope soon to walk around Hogwarts with my Slytherin uniform.
Hufflepuff for life