Informal transactions can lead to a great deal of of confusion, delays, and disputes. Because there are so many of them, it’s very easy for stakeholders to forget or lose them, and then that leads to confusion and delays where the stakeholders are trying to remember, dig through mountains of texts / emails / chats and figure out who said what when. This is very costly and adds a lot of risk to projects. When these confusion and delays don’t get resolved, it could even turn into a legal dispute, and then that adds even more risk and cost.