However, since if it is still being used, then it still has some capability that is not available in other solutions.
No, no, no, no!
COBOL is still in use because because mid-to-large corporations spend many millions of dollars on systems that WORKED, and now it's far cheaper to keep them working, the same old way, than it is to do it all over again with modern equipment and languages.
This is called "installed base" and it's a particular problem for COBOL because that was one of the first business languages, and has one of the largest, large-corporation "installed bases".
COBOL has nothing to offer that newer languages don't do better. Not. One. Thing.