As a front-end developer, I would say that for a front-end developer it is a bonus to have some skills in UX/UI design because that prove he is able to understand what designers are doing. It is easier to have a good communication between the dev team and the design team when they can share their feedback and have a comprehension of what aim they both need to reach. But I think it is wrong to expect from a developer to product designs. Unless if he has a real design background and experience.
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