Sure, and I apologize for the two letter comment.
"The adult child who decides to estrange does it as a last resort. "
I don't agree with this statement as a generalization and based on my personal experience. Estrangement is punishment or possibly, simply, lack of concern for someone who typically is deserving of it.
It is usually intended to be cruel or insulting.
Estrangement as a response to abuse by a parent or legitimate lack of respect is appropriate, otherwise it is not- it is simply rude and hurtful.
We live in an increasingly impolite world where treating people poorly, whether a relative or person on the street, is normal and OK.
I think a lot of estrangement is transferrence, misdirected anger. That is not OK and shouldn't be suborned.
I have often seen parents desperately try to get their child to love them again, be friends again. If, as a parent, you don't deserve to be treated that poorly, it is on your child, not you.
They need to grow up, and that growth should not be purchased by parental bribery.