As a photographer, I have particularly stringent standards when it comes to CRI--I can adjust white balance very easily with continuous-spectrum sources, either with filter/film choices in traditional photography, or with a color temperature adjustment in post-processing of digital images. But if a particular wavelength isn't present in the light source, there's no filter I can use or PP action I can take that will add that wavelength back in.

Add that to my natural pedantry, and you have Yet Another Way that the universe can annoy me. :)