They're talking about a design perspective. People like the lime green toaster because it by itself looks nice, but if they placed it in _their_ kitchen, it would probably look absolutely ridiculous unless they're designers and know how to perfectly balance such a strong color in the room.
In contrast, neutral colors will look good in any color palette and require zero design talent from your side.
In contrast, neutral colors will look good in any color palette and require zero design talent from your side.