Why? Because it's missing hate groups?

Because it's missing half the country, many of whom are not part of hate groups.

I'm not American, so I don't really care about missing half the country.

This reads like you're implying anyone right of center cant be gay, into renewable energy, technology or the arts/philosophy.

There is no “teacher” who is going to grade you on how representative your social media feed is of the country. The point of creating an online feed could be entertainment, to arm you with the information and means of communication necessary to accomplish some goals you take part in, etc., but there is no point in trying to achieve some representative feed. You will not be rewarded for it.

The original discussion was about the diversity of the feed, so...

They're more diverse than my IRL friends. It feels pretty diverse to me, I follow multiple types of communist and anarchists, some climate and privacy advocates, general progressives and even some more centrist EU people and a ton of people whose politics I know nothing about.

When I follow people I mostly just check if they don't have any posts that are homophobic, transphobic or racist, because that is shit I do not want on my timeline. For the rest I don't really care, I just follow the people whose posts I enjoy reading.

There's nothing especially wrong with keeping your feeds focused on like minded people, so long as you understand you're not the world.

The alternative for many might very well be attempting to hunt down and censor anything they find objectionable, so their feeds can be both representative, and clean.