For the square range there is nothing wrong with a non-illuminated reticle, or a reticle that can't be seen during bright day light, with use of white light, etc.
For people who are operating outside the controlled enviornment of a square range, an illuminated reticle that can be seen under all conditions can be more of a "need" than a "want".
A couple examples of this is:
-Consider going up a stair well with your CQ/T a bad guy has on dark colored clothing. You and a couple other members all have your 9 volt surefire lights aimed in on him. He won't listen to commands. You can't find your reticle because the lights are bright enough to wash out the illuminated reticle and the black reticle is blending in with his clothing. This happened to an Officer I know who use to use the CQ/T.
-Often times, when it's bright outside bad guys, like cockroaches, like to hide in dark areas (barricaded gunman inside a dark house, suspect hiding in a salvage lot under a pile of wrecked cars, under a sheets of plywood leaned up against a fence, in a dark secluded breezeway, etc). If you under the bright sun light in the middle of the day and the suspect is in a dark area, you may not be able to see the reticle as the sun light will wash out the illumination and it's extreemly difficult / sometimes impossible to see / find a black reticle against a dark background.