Results. Results. Results.
Concept design is all about speed, iteration, collaboration, and the related pressures to perform. Indeed. You'll likely want to streamline your workflow, see greater productivity, and feel better about your creative results as well.
For these reasons alone, not many people today still work in the analog paper world, due to the inefficiencies of drawing, scanning, tracing, and reworking content. Even students are graduating from creative arts programs steeped in the use of Wacom gear and ready for careers in game, commercial animation, illustration, and motion design.