Without Legends , we wouldnt have the Legendary supertype (or the Commander format) or multicolored cards, and Magics lore wouldnt be nearly as well-integrated into the game
Just look at the value it provides
POKEMON DARK MUK "1ST EDITION" TEAM ROCKET
Several factors have driven the widespread interest in Pokmon card grading, catapulting it to new heights: 1
(See rule 510, Combat Damage Step.) 702.7b If at least one attacking or blocking creature has first strike or double strike (see rule 702.4) as the combat damage step begins, the only creatures that assign combat damage in that step are those with first strike or double strike
Reading these cards could never explain these cards, and for my money, thats a design step too far