They thought that Yue Jingchen was not mature or strong enough to protect Yu Zi.
As a man, it did not matter what abilities he possessed if he was not able to protect his wife at crucial moments, what use was he?
As they were so unhappy with Yue Jingchen, they completely forgot to be upset about Yu Zi being taken away by another man.
As Yan Huaian was superior in every way, they could clearly sense that there was not much of a loss for Yu Zi.
It was different for Yuan Hejing. All she wanted was for her daughter to marry a good man. That man should be able to treat her daughter well, love her and protect her, and never allow her to be bullied in any way.
Yan Huaian seemed capable of all that. He was mature, dependable and slightly older than Yu Zi. He would be able to love Yu Zi and treat her like a respectable lady.