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Click Mechanism Pros: feedback on toggle: aural, visual, and tactile speed of opening ease of one-handed operation lighter (spring operation) perception: pen is "fun to play with" due to feedback Cons: accidental opening Twist Mechanism Pros: deliberate operation longer life perception: "higher quality" pen due to weight Cons: difficult to ...
Just off the top of my head: Fewer parts. So less to go wrong/ break. Fewer parts. So simpler to make. Fewer parts. So cheaper to make. Fewer parts. So more eco friendly. Harder to open accidentally Easier to tell whether "open" or "closed"
There are two aspects here to consider : You cannot always expect your users to provide perfect inputs : While there are ways to restrict users from making obvious mistakes like entering alphabetical characters in a number only field or entering a invalid email id, you cannot force users to use a specific format for everything as users will surely make ...
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