Often a key problem with interdisciplinary study, as you described it, is that the people who know A and the people who know B are often both bad at communicati

Often a key problem with interdisciplinary study, as you described it, is that the people who know A and the people who know B are often both bad at communicating outside of their expertise. Sometimes terrible. Even worse sometimes when they teach A or B, because they incorrectly believe they are good communicators due to having some success as lecturers, but don't realize how narrow that is. So getting them to talk to each other often isn't nearly enough - you need a translator in the conversation, or you need to teach them to be more effective communicators.