Every year I see plenty of people go "oh, I wish someone had nominated more women/more chromatic characters/that person" when they find out about the challenge posts. Every year there are duplicate nominations for characters from people who didn't coordinate.

I don't understand what you mean by "fourth fandom." I've teamed up with friends in the past to nominate multiple characters from an ensemble show, sometimes that's one or two extra characters, sometimes it's eight characters total. I see people do this a lot. It results in more choice and more opportunities from people who want these characters nominated.

If you don't want to nominate more characters, you don't have to. If you want to, it's best to coordinate with fellow fans. That's all this post is saying. Clearly you don't want to nominate more characters, and that's ok. Then this post isn't for you.