Self employed spouses who owe support and don’t want to pay are difficult to collect support from since they will not honor a wage assignment. They need to buy into the agreement which will not be the case if the judge tells them what to do (pay you). Those kinds of people need to be in mediation so they "buy in" to the agreement. They will be more likely to abide by it if they helped fashion it. The one size fits all won’t feel good to people who don’t like being told what to do.