Usually, if a product wows me — if the design makes it obvious where to go next without having to think — it’s doing its job. That’s a strong signal it truly fits the needs of its target audience.
Good designers add the right details while removing unnecessary complexity.
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I'll answer this as someone who works in UX as to what the benefits are. It's either guess your assumptions are right and possibly lose everything on bad UI/UX or, at a fraction of said everything, give your final product a fighting chance with user/professional input