Each style of user interface is obviously not going to be the best for every single person, but for people who are used to using a keyboard, and who interact with software for long periods every single day a keyboard shortcut focused interface could be much more efficient (and they are - ask anyone who does 3d modelling for a living).
Designing user interfaces for some hypothetical "average person" that's using it for the first time might make sense for consumer software that's sold to everyone for occasional tasks, but there's plenty of software that benefits heavily from having a bit of a higher learning curve in exchange for faster/more efficient interaction.
Designing user interfaces for some hypothetical "average person" that's using it for the first time might make sense for consumer software that's sold to everyone for occasional tasks, but there's plenty of software that benefits heavily from having a bit of a higher learning curve in exchange for faster/more efficient interaction.