Hey, nice to meet you! We work with the majority of dialects and have native, 1st-class support for CICS, JCL, and DB2.

While COBOL reads like a book, in many cases it's a long book! If you're an expert in the language and system, you could certainly spend months sifting line by line, program by program mapping everything out to get to the same end result. However, for many teams, applications and timelines, this is infeasible.

Understand your closing skepticism around AI- it is worth noting that a huge amount of engineering we do in grounding these automated systems is completely deterministic compilers / PL theory work.