The problem is that they are often prone to emotional abuse and occasionally physical abuse. The option to not leave means people (usually women) put up with a lot. E.g., here is an article https://www.thehindu.com/society/sum-of-her-parts-why-are-th... on why organ donors in India are mostly women. Arranged marriages allow this kind of coercion to happen. There is a lot of other stuf why it doesn't work very well, if you expect to be equal partners.