What is the significance of adding the banish aspect to Baited Hook's errata?

Ruling: The banish aspect was added so that if you cannot play the card for some reason, it will stay in the banish zone instead of returning to the deck.

Nuances:

• With Baited Hook, you are not required to banish if you can't play the card
• If you banish a card like Cruel Patron without having units available to meet its play requirements, it will stay in the banish zone rather than going elsewhere