If you're happy with working with something that destroys your brain and makes you useless to any other software technology developed in the last 20 years be my guest.
COBOL doesn't destroy your brain, that I recall. In fact, if it bores you, it leaves a lot of brain capacity available for funner stuff, like MVS exploits via Resolve.
To me, it's the cool-app-of-the-month-that-harvests-private-data-off-peoples-devices that is brain-killing.