Yes, having it prewired is one thing and beneficial as even a smallish install can benefit from it, that is a TV and some speakers, nothing fancy. It can be ignored, not used and would not detract from the room.
But, when you apply such paint colors that have very limited appeal to most home buyers, that can be a turn off, even if they just want a TV and some surround speakers. So, wiring is a yes, dark special colors would not be my suggestion