A: No, in fact, you should always try to satisfy guests with the fewest cards possible.
For example, if you have a Dessert which provides two qualities the Guest needs, then you only need one other card with the last remaining icon to satisfy all three requirements for that Guest.
You’ll note that a Guest’s favorite is a single card which provides all three of their requirements. That’s what makes it a favorite! It’s the perfect Dessert to make them completely happy!