Although, the team members enjoy working with people who they have a good rapport with. However, in my experience roles are allocated in a team based on a team member’s expertise and background. There are always few subject matter experts depending on the scale of the project. Rest of the team may not have any experience with the matter before. Personally, the project that I was allocated to at my work was not even remotely close my expertise/background. Companies usually assign team member based on how well they judge your level of adaptability.