It says the majority of the problems caught in E2E were due to changed contacts, so it makes sense to have a dedicated test type for those errors. If the remain

It says the majority of the problems caught in E2E were due to changed contacts, so it makes sense to have a dedicated test type for those errors. If the remaining caught bugs are few enough and their customers are willing to suffer occasional unavailability, just let them be caught in production and save that expense.