The honest case for a black floor
A dark floor makes whatever sits on it the subject. In a car showroom, a retail display or a studio, that is exactly the job, and no other floor does it as completely. The room recedes, the product advances, and photographs of the space work. That is a real and legitimate reason to choose Graphite, and where it applies we install it happily.
The honest case against it
In any room without a daily cleaning routine, a solid near-black floor looks dirty most of the time. Dust is pale, and there is nothing on this floor to hide it against. Footprints show. A dropped screw is invisible until you step on it. If what you want is the drama of a dark floor in a room people actually use, Obsidian Gold gives you the same darkness with movement that hides the dust, and it is the recommendation we make far more often than this one.
Finish level matters more here
A gloss black floor is a mirror, and a mirror shows every imperfection in the slab beneath it as well as everything on top of it. On anything but a very flat, very well prepared floor, a satin finish is the better call: it keeps the depth of the colour, cuts the reflected glare, and stops raking light from picking out every trowel line and patch. We will usually push for satin on a dark solid colour unless the slab is genuinely exceptional.