Chinese doesn't have to use A-to-Z with Pinyin. There are input methods like Cangjie, Wubi, Bopomofo, 1-to-9 stroking on number pads, and handwriting. But yes,

Chinese doesn't have to use A-to-Z with Pinyin. There are input methods like Cangjie, Wubi, Bopomofo, 1-to-9 stroking on number pads, and handwriting. But yes, pinyin A-to-Z is the most pragmatic for many reasons.