Imagine if Star Trek, the Original Series, used popular 1960's slang in every bit of dialog.
Standard English is always preferable to slang because slang quickly goes "out-of-style", and dates a show in an unflattering way.
The only exception is when slang is used as comedy, on purpose.
Try this clip of "I Dream of Jeannie" from 1968. The slang used in this clip was already obsolete by the time of airing!
Commercial television was never hip, because the lingo changed faster than the old fashioned networks could keep pace.


