Because, it's kind of unfair to those of us who don't know how to use/don't like/don't use sprites, since we go through the work of drawing each individual cat rather than just coloring a sprite.
On another note, you can't quite personalize the cat if you're using a 'warrior' sprite. Adds life to the drawing!
And by sprite, I mean like 'here I have this Leader lineart I'll color this for Blizzardstar, and color this Deputy lineart for Leopardclaw, and then I'll color this Warrior lineart for Tatteredleaf, Emberheart, Sharptooth, Leafstorm, etc'
Oh, and it isn't a talent competition. It's a combination of all skills and styles, so if you can make a cat look like a cat then go for it.
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WCC's Resident Wingwoman and Third Wheel*Queen of Spur of the Moment Decisions
Can be contacted through Discord * Talk to my cats in Starclan * Will use Starclan cats for Moonstones if you can't find someone