Why is it common to type without looking, but not texting?

Please give me explanation about this.

Most people text with only one pointer finger or with two thumbs. However, typing on a keyboard allows people to position all of their fingers to type, using touch typing. Touch typing refers to a style of typing that uses a sense of touch rather than sight. In this method, students learn which fingers to use for each key based on hand placement, rather than having to look at the keyboard.

The Typesy Team