In the speedrunning community, it is common to establish specific categories to differentiate the ways in which games are completed. One such category is "Glitchless," which involves completing the game without exploiting errors or technical glitches that may grant advantages or shortcuts not intended by the developers. The inclusion of a "Glitchless" category on the Gears of War: Ultimate Edition speedrun page allows players to demonstrate their skill and knowledge of the game by completing it as closely as possible to the developers' original intent, without resorting to exploits.

This distinction is important because some glitches can significantly simplify or speed up certain sections of the game, which could detract from a player's skill in a standard playthrough. By separating the categories, both the skill of effectively executing glitches and the ability to complete the game without them are recognized and valued. 

For example, in Gears of War: Ultimate Edition, there are advanced techniques that allow players to bypass parts of the game using glitches. However, by competing in the "Glitchless" category, players challenge themselves to complete the game without resorting to these methods, which can be considered a purer test of skill and strategy.

In short, the presence of the "Glitchless" category on the Gears of War: Ultimate Edition speedrun page gives players the opportunity to choose between different approaches to completing the game, either exploiting glitches to achieve faster times or playing without them to demonstrate more traditional game mastery.