A new type of computer keyboard has been introduced on the market. The new keyboard has the "three most" characteristics that traditional keyboards do not have, that is, the most commonly used keys are designed the closest to the most flexible fingers. The new keyboard can greatly improve typing speed and reduce error rate. Therefore, replacing the traditional keyboard with the new keyboard can quickly improve the work efficiency of related departments. Which of the following, if true, would most weaken the argument? ["Some keyboard users' most flexible fingers are different from ordinary people.", 'The most commonly used keys in traditional keyboards are not designed to be farthest from the most flexible fingers.', 'The more efficiently you can use a traditional keyboard, the less likely you will be proficient in using the new keyboard in the short term.', 'The price of the new keyboard is higher than that of the traditional keyboard.']