Do you also refuse to call music albums "albums"? The etymology is the exact same thing. Terms stick as formats change, that's the English language as it is used and it's not new or wrong.
What etymology? In the overhead projector days they were called transparencies (not cards), and you would have said "a stack of transparencies", not a deck.
Deck is a new made-up business jargon.
You can not like the word if you don't like it, but pretending it's somehow wrong is absurd and just you trying to claim some kind of authority for your opinion.