Taunus focuses on delivering a progressively enhanced experience to the end-user, while providing a reasonable development experience as well. Taunus prioritizes content. It uses server-side rendering to get content to your humans as fast as possible, and it uses client-side rendering to improve their experience.
While it focuses on progressive enhancement, usability and performance are both core concerns for Taunus. Incidentally, focusing on progressive enhancement also improves both of these. Usability is improved because the experience is gradually improved, meaning that if somewhere along the line a feature is missing, the component is still expected to work.
Via Jan Hesse