How much do tools such as this one help with reuse or porting of real COBOL applications, as opposed to textbook examples?

As I understand it, many COBOL programs of current practical interest make extensive use of data management and transaction processing facilities that aren’t part of the COBOL language itself.

Can anyone share their experiences? For example, what fraction of the COBOL modules in a typical application would be able to be translated by a compiler that doesn’t handle statements such as “EXEC CICS” or “EXEC DLI”?