their stories have far too much background happening before you even touch them
Is this a fair criticism? IRL everyone you meet except babies has heaps of background before you meet them, and how much background they share develops as you get to know them. Hell, I worked with a dude for a couple months before learning he was minor nobility, but it was such a non-thing for him you wouldn't know it without being told.
That the backgrounds are too thematically similar is a criticism I understand, even if I don't share it, but I think "far too much background" pre-story might be a bit much