I worked on software that had the ability to change the hue of an object. If you had a bright blue car and wanted it to be yellow, changing the hue to yellow worked perfectly. Then the perceptually correct zealots took over and mandated that all color manipulations would take place in the Lab color space. Now the intense blue 0,0,255 didn't turn into an intense yellow 255,255,0, it turned into what was considered a yellow of the same lightness - 31,31,0. This was too dark to be useful to anybody, and there was no way to compensate. Worse yet it wasn't even correct, because the lightness isn't accurate for intense saturated colors - if you look at 0,0,255 and 31,31,0 side by side you'll see what I mean, they're not even close to the same perceptual lightness.