I’ve been working in enterprise for ten years and I wouldn’t call any of the services I’ve worked on simple.

There is probably a marvelous software core in many large enterprises but at least in my experience it’s surrounded by layers and layers of very basic stuff. Read from a database, write to a database (often not even with any logic dealing with parallel read/writes). Excel Macros. Basic forms to submit data. Scripts to print some stuff from a database. …