Yes, Bianca - witnessing the tumultuous, toxic relationship of her parents (and uncle) at such a young age (and setting her dolls on fire), already suffering an eating disorder and relentless bullying at school - developing a substance abuse addiction would totally fit.
Kendall actually had a comfortable middle-class upbringing in Florida, with her parents, by all accounts, spoiling and doting on her (which might explain her sense of entitlement).
While Bianca grew up privileged, with wealthy parents (the apple of both their eyes), the emotional scars ran deep.
I agree about Ken
Remember how that dinner party scene was edited to make Kathryn look absolutely awful and LVP not great either? And yet Tom snapping at Geishabot to pipe down was not worthy of inclusion back in S6.
After that episode originally aired, we rarely if ever saw Tom interacting with Erika and the women again, and Erika made it sound like he was too busy and 'above' mere reality TV. Now we know why.