While every design project has a new set of challenges. Designing a companies first product requires a slightly different approach. The design process - research, ideas, vision, documentation, etc. - is inherently the same. What is different is this first product sets the stage for the new company. The new company will be judged by what it does, how well it does it and if it visually delivers on the promise of what it does.
Another way to look at it is building brand equity. Apple or Samsung, VW or Ford, all have established brands and people expect certain features, performance, etc. from them. A new company is starting from scratch.
Designing the right thing for a new company requires listening, advising and showing the possibilities. It is about establishing a design vision that is appropriate for the new venture.