Pens without ink are useless.
Cars without gas are useless.
Printers without paper are useless.
Lights without electricity are useless.
Consumable materials are critical for operating equipment. The notion of “you can’t ban the equipment, but _can_ ban the consumables it operates on” is absurd, a flaw of the English language.
“Pens without ink are useless.
Cars without gas are useless.
Printers without paper are useless.
Lights without electricity are useless.”
Politicians without morals are useless.