As a graphic designer, it's common to hear clients asking for their logo to be bigger in the design solution you present to them.
Seek to understand the goal of the client. The ability of my client to trust me as a designer is dependent on the depth of our relationship. I will have to take time to understand their goals, and educate them on the design strategy. At the end of the day, the logo (brand) will be the "biggest" element in the context the bigger picture.