>>164079
Because as special needs as the others may be, they tend to have specializations and get assigned to squads that give them goals and a purpose. The closest exception is the ACPU, but Poli is the greatest tard wrangler in the Ark and does everything she can to give her squad mates realistic goals. Among individualized nikkes, squads are a family and a home, and are very protective of their members, but we've seen that among the mass produced squads are groups of convenience that have no particular loyalty to each other beyond familiarity. The big three and CG don't care what squads do as long as it's along the lines of their mission statement, they complete any special tasks given to them, and they don't break the law
Mori has no specialization and was given no squad, so despite being a personalized nikke, she has to slum it with the mass produced. The mass produced look down on her because she's supposed to be above them in status, but has to beg them to be part of their squad. They find it funny. It's like seeing a man in an expensive suit applying for work as a janitor. Mori is explicitly described as being average in every way, so she has no means of advancement to a real squad. She's a nikke middle child, she has no tribe and no people.
Tl;dr, Miranda may be an untalented retard, but she has the luck of being ACPU's retard, and Anchor may be weak, but she has specialized sonar abilities and is the Admire's weakling. Mori has no abilities to stand out, and no squad to protect her. None of this super secret lore, it is quite literally EXPLAINED TO YOUR FACE IN ALL OF THEIR STORIES.