Sometimes, for a person's mental health, they need to distance themselves from family. Especially if the family is abusive.
I'm not saying that the royal family is, who knows, but the family members know what it involves, living as a royal.
There have been somewhat judgemental comments on the departure of Meghan and Harry. Very few of us know these people, if good or bad.
From my personal experience I know how it feels to be judged for distancing myself from an abusive family.