In UX, simplicity does not mean having as few elements as possible. This would be minimalism. Simplicity means, having the lowest cognitive load: don't make me think!
I designed a sign-up form that asked for the first name, but not for the last name (because I didn't need the last name). After a few user tests, I learned that people are so used to entering their last name after their first name, that almost everyone filled the last name in the email field (which was next).
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Design your interface as simple as possible, but not simpler. Stick to patterns your users already know.
Written by Jonas Kamber, Digital Product Nerd and UX Enthusiast since 1998. LinkedIn