How does understanding end user demographics help Monica make a design pitch to her client?

She'll be able to articulate the technical requirements to execute the project.

She'll know the value of the client's brand, and what sets it apart from the competition.

She'll have data $($i$.$e$.,$ demographics$)$ to support her ideas on how to reach the audience. The data will show that her ideas are ones which will appeal to the audience, and to which it can relate.

She'll be able to Assure her client that the competition has nothing like what she proposes.