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Or y'know that they just care more about keeping the people they know and care about safe then some faceless others that they're expected to fight and die for.
Well, yes. You can also put it that way.
Given I wrote the vast majority of the Tears, Storms and Mirrors pages the OP linked to and basically rebuilt the Twilight Queens into their current form [1], I can pick out elements from any of the Twilight Queens to support my argument. If I wanted to, I could argue that we should be playing Mirrors because the seer elements provide something the Radiant really need, and in many places Mirrors is counted among the Radiant. And that through Mirrors, Emma can learn to channel her queen bee instincts productively and that with the drive, we really can make her better and that as she grows, she can learn other Invocations so she can use Mirrors for her unique talents without letting it define her.
But I wrote the Twilight Queens so all of them are entirely playable - even as part of a Radiant party, as a dark magical girl working with the PCs - so of course I know that all of them can be played as flawed heroes. Especially on their own for a young Twilight Noble, they can be quite hard to tell from a just-starting Radiant. Because that's what the Twilight Queens are - they're foils to the Radiant (and thus like a lot of foils, they're broadly more interesting than the thing they're foiling).
[1] And that's why Queen of Mirrors is a strange seer living at the end of the rainbow who's constantly looking for the True Queen and who's sacrificed her own agency in the obsessive desire to find the one person who can make things right, rather than what certain other people wanted which is that she's a spoilt brat who wants people to be her playthings.