Final answer:
If someone replaces the soft serve mix in a shake with a non-dairy alternative, the shake would need to be made sweeter to make up for the lost sweetness.
Step-by-step explanation:
If someone replaced the soft serve mix in a shake with a non-dairy alternative like oat milk or almond milk, the shake would need to be made sweeter to make up for the lost sweetness. This is because the soft serve mix contains sugars that contribute to the sweetness of the shake. By adding more sweeteners, like sugar or syrup, the shake can regain its sweetness.