Yes, it is taught. If you take a typing course, you will be taught to use home row. What you mean is, you were never taught to type because we don’t teach that in school anymore. If you do most your typing on a touch screen, I have to imagine: you are so young. In 20 years when no one is using a touch screen to enter text anymore (but likely still use physical keyboards), you will remember this conversation, and have some greater insight.

Whether or not you know how to touch type, in any situation where there is a mouse, THERE IS A PHYSICAL KEYBOARD. Not knowing how to touch type just makes the task switching overhead greater.