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There's literally nothing wrong with holos just being colleagues. It's a job. The one where you are part of a "team" and do public performances with them, but a job nonetheless.
You'll never be friends with all your coworkers and that's absolutely normal. You click with some people and you become friends, with some you do not and just stay on a distant friendly basis. That's the way it is and that's fine.
The Unity shit and "they're all supposed to be lovey dovey with each other" is dumb and regurgitated by people who've never actually had professional relationship.
If you're bitching about them not being close enough to each other, get over yourself.