The standard zhuyin input is laid out on the keyboard in order. By in order, I mean it is in the same order as the sounds have been taught for many generations and still are today (https://www.youtube.com/watch?v=YlNGJzYJQDI).
It would be like if English speakers didn't use "qwerty" keyboards but instead used "abcde" keyboards. Touch typing would be far easier to learn. My computer doesn't have zhuyin printed on the keyboard, since I bought it in California, but I type zhuyin on it every day. Even before I could touch type, it was easy because it was in order.
