Every couple of years i build a new PC, explicitly with gaming as a main usecase.
But in contrast to the mainstream gamer prejudice, i don't really care about the looks of the machine.
If i can get a component without RGB, or even without superfluous LEDs, i will take that. Sometimes that even means paying more

If i can't get something without lights, or the price difference is too large, i at least try to turn off as many LEDs as possible.
I generally do not care how the box looks on the inside. I do the bare minium for "neat-ish" cable management so that no loose cables can touch fan blades, but thats it.