Black is black. I think of a darkroom as the inside of a camera. Would any level of light leak be acceptable? A changing bag for loading film in a daylight processing tank would be safest if the darkroom is not 100% dark.
As others have said, this may eliminate the ability to do some things like tray process. I myself always try for perfection even though its seldom achieved.
So, "Don't slack, make it Black" . It is not that hard to do and you only have to do it once.