no, because those are more durable then the cards.
also on page 4 in End of Round:
*Return all workers in play (on spots and those in town square) to their respective owners
* Refresh any assistants that are tilted sideways (Their abilities can be used again)
*Shuffle all face up cards on the board separately after type, and put them , without looking, face down at the bottom of their respective piles. Then fill up the board as you did during the first setup (If a deck runs out of cards, then it runs out. Nothing more to it)"
Pretty sure that means you shuffle cards every turn.... so yeah I would like to protect my hard to come by game.
You are shuffling 2 - 3 cards at a time during the game and putting at the bottom. It's barely shuffling but I understand the desire to sleeve since its a fun game.