It would seem that the "golden hour" is maybe an invention of the photographer so that what is captured can fit within their means to provide output.
...
Or it may be what, generally speaking, looks most pleasing to most viewers. When watching a landscape as the sun rises I've always noticed a peak in the quality of the light that fades long before the ability of a given camera to capture it. Sunset, of course, is similar but in reverse. I use the word "quality" here to mean many things, like the texture of objects that is emphasized by the angle of the light, the color temperature, the "
belt of venus" before sunrise and after sunset, sky color and texture, etc.. Relative to the "golden hours" of morning and evening most scenes in cloudless midday light are not even that pleasant to look at, much less photograph. As with all things there are exceptions, but I find morning and evening are the most pleasant times to be out looking at things, even without a camera. Likewise, fog and other atypical weather conditions add drama and uniqueness to otherwise typical scenes. I can't say I've ever considered the capabilities of an output device when taking photos, but maybe that's just me.
Edit: In the end the gamut of the capture is just mapped to the gamut of the output device. They don't need to match. For instance, people still make black and white images. The medium didn't go away because color was invented.