Design already decides how the product should look. Foux carries that as far as the real page, so the answer comes from the person with the taste for it.
People can tell when nobody touched it
Prompting a front end has never been easier, and it shows. Generate enough of it and products drift toward the same handful of shapes. This is how we end up with everything the same blue-purple gradient.
The gap turns up weeks late
A change that travels as a picture and a paragraph gets read honestly, reasonably, and differently. By the time the difference surfaces in review, saying "not quite" costs a second ticket, so it often goes unsaid.
The change is design's to settle
Which element, what it should become, and whether the result on the real page is actually right — decided before anyone is asked to build it, and revised without asking again.