It violates the clear language in every Ashkenazic Ketubah
It is based on mechilah. If I lend you money with a shtar, and then forgive the loan, are either of or both of us violating that shtar?
The trade off Lior speaks of is not halachic, it’s the benefit of the talmud Torah vs. the cost in chinuch and in some cases tzniyus (which is often a trade off for men as well in their workplaces).