They're referring to full stack as a single developer. As a team, you can each focus on your respective parts of an application. There are benefits to being a "

They're referring to full stack as a single developer. As a team, you can each focus on your respective parts of an application. There are benefits to being a "full-stack" developer for smaller projects, such as understanding all the working bits without needing to communicate with others, but full-stack jobs don't seem to pay as well as a job within a specific scope like backend.