Over exaggeration at it's finest. Perhaps it's easier, but as stated above, it's all your choice to turn the skull on. Also, how would you know that they beat Legendary with this skull unless they outright say "I beat Halo 2 Legendary with Bandanna on.", also, why care to a degree to say it will "ruin" Halo 2? If they beat it with this skull on, good for them, great. If your personal preference is to beat Halo 2 Legendary with no skulls, then just care about what you do, not what they do.
+ Halo 2 will be hard on Legendary regardless of Bandanna being activated. CE sure was.