Service composition is highly complex and often includes transactions, unit-of-work boundaries, error handling, security and propagation of credentials, and aggregation of business logic.

服务合成(service composition)是相当复杂的，而且常常涉及到事务、工作单元边界、错误处理、安全性与证书分发、以及业务逻辑聚合等方面的问题。

youdao

Did all these jobs get that much more complex or do we just put that much emphasis on credentials?

FORBES: Thinkers < Technicians? - by Brian-Anthony Garrison

In my experience, most managers in the health service have no credentials and have passed no tests of competence, although medicine and health-service management are very complex affairs.

ECONOMIST: Letters