The main advantage of the Dvorak layout is more intuitive positioning of the most frequently used keys while at the same time reducing the inefficiencies associated with placing seldom-used keys in control of the most dexterous fingers. The typists can control the vowels with just the left hand leaving the right hand free to manipulate the most important consonants. Although somewhat out of date today, the belief that most people are right handed led to the manipulation of the most keys (the consonants) by the right hand. However, even left-handed typists find that control of the vowels by just one hand results in more efficient (faster and accurate) typing.
It has been posited that learning to type on a Dvorak keyboard by the uninitiated proceeds faster than with the QWERTY layout. This seems incomprehensible for a typist attempting to switch from QWERTY to Dvorak but the novice typist finds the layout intuitive rather than that of the seemingly random placement of keys on the QWERTY keyboard. However, teaching the Dvorak layout to novice typists serves as an injustice to the student as he/she is soon released into a QWERTY-dominant world where a relearning must take place to conform to the current standard. The most important disadvantage of the Dvorak layout is steeped more in learning than in manipulation of keys on a keyboard. The QWERTY layout has stood the test of time as the standard layout since its inception on the earliest typewriters. For over a century, the QWERTY standard continues to be the layout taught in schools and found on most computer keyboards. Any campaign to switch the layout from one to the other would face opposition of the familiar and ingrained layout currently reigning. Even individuals using the Dvorak layout have trouble switching to another keyboard using the QWERTY layout. Since the majority of individuals use the standard keyboard, switching to another is an annoyance.
Another disadvantage of using the Dvorak layout is the multiple layouts that purport to derive from the original Dvorak design. In the 1930s, computers did not exist. The keyboard of the time had no use for many of the functions found on the modern computer keyboard. Consequently, the Dvorak design had to be reinvented as the capability of the computer keyboard changed. For example, the original Dvorak layout did not have “ctrl” and “alt” keys and certainly there was no Windows key. Over time as these functions were added, the Dvorak layout changed to accommodate the additions. Also, several offspring of the Dvorak layout such as one-handed versions complicate its adoption.