For example, to build your web-app you hire a team (backend, frontend, all-end, QA) all as a unit.1. team could have more negotiating power vis-a-vis big-co
2. worked together on multiple gigs (hopefully), 
3. fewer interpersonal issues (again hopefully)
4. know their tasks on the team from the get-go.
..many more.why isn't this more popular?