Shalaleh Barlow says legal rulings on "alienating behaviour" take too long and are harming children.
A family law professor says a new study highlights how little people know about divorce.
A judge says the order cannot be overturned but the law firm says this verdict is a "bad decision".
The reforms had been due to come into force last year but are now expected in June 2024.
Both current and retired staff face "a severe and drastic impact" from the delays, say solicitors.
Ministers say mandatory mediation will cut court backlogs, but fears for coercive control victims are raised.
"I have asked your Mum and Dad to behave a bit better," Judge John McKendrick told the brothers.
One law firm says January sees more couples asking about divorce than the other winter months.
The most far-reaching change in divorce laws in decades has come into force in England and Wales - ending the need for separating couples to apportion blame.
