[Rochus]

This is about the MUMPS 1976 standard. I'm not aware of any jobs where this is required. It's purely interesting for historical reasons. The article is part of my anniversary project (https://github.com/rochus-keller/MUMPS/). I neither think that "your career will suffer" if you do Ada, Fortran, Mumps (i.e. M/Cache/IRIS or GT.M/YottaDB), RPG or Cobol projects. Specialists are well paid, particularly with mainframe and domain experience.

[odyssey7]

My comment is about MUMPS, not a specific edition of thereof. A language is inseparable from its community. The opportunity cost of working with MUMPS is enormous, particularly for someone early in their career.