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And because (a) blue light causes your eyes to become bright-adapted, ruining your night vision, (b) blue light is incredibly distracting in your peripheral vision causing massively more glare than "warmer" light sources, (c) blue light screws up circadian rhythms for people and wildlife.

Don’t forget the sun. The sun gets to a warmer color at sunset, hence why warm white conveys a "go to bed" meaning.

Many millennia, actually. A million years at least, quite likely more.

Co-evolving to be comfortable with a certain quality of light, is a good argument for maintaining that quality of light, and for not using light with a quality which triggers subconscious (or conscious) discomfort.