Multimedia principle and the contiguity principle

Context

Suppose you’re developing a course with another instructional designer.  They’ve been an instructional designer for 6 years and you’ve been in your role for 1 year. You’re working on a course that is on a compressed timeline and on a limited budget.

Challenge

Your colleague tells you that the multimedia principle and the contiguity principle don’t matter in real design because they are concepts in a book. What would you tell them? What key points would you use to influence their thinking around these principles?