I do use blackbody lights, but not all the time. Blackbody works great for an actual light/emitter, but not so much for light going thru treated glass, offsetting an environment casted color, atmosphere, etc. You are correct in that blackbody has it place, but there are other times you need a specific color to get an effect.

In that scene above that I posted the entire construct has the velvet texture on it, and without the blue light everything is red......

Sometimes faking, it is far better than doing it accurately, even in real life.

A perfect example is real stage lighting. You use known temperature lights, with gels in front of them change the color.

And those stage lights are 100% physically realistic and accurate.

Both ways have their place, in rendering and the real world.

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