Not universal but typically yes there will be a code of conduct document setting out things like "the game is PG 13" and "no harassment" and things of that nature.
-Have cards
-Bring them to the game
-Distribute and tell people how to use it
-Include information about the card in code of conduct.
No, none of these take long or are challenging. But if you add every nice to have 30 second thing, you end up with quite a long spiel to start the game and more information for players to take in. So if the card is not materially helping games, across at least my own experience...I think it is reasonable to look at cutting it.