What is the obsession with learning loads of programming languages? If you pick well, you only need a couple and you can spend your time and mental energy buil

What is the obsession with learning loads of programming languages? If you pick well, you only need a couple and you can spend your time and mental energy building new things. Note: This is not to say I do not appreciate the value of learning different languages. It just seems to be an obsession to tally up as many different languages as possible instead of building new stuff with the languages you know.