This is the fundamental design mistake that Microsoft has made which is what went wrong with Windows 8. A touchscreen and a touchpad are quite different and incompatible and one does not replace the other. One is suitable for tablet mode where you are interacting with the whole screen and picking it up, moving it into the correct ergonomic position for direct control. The other, which allows relative motion, is suitable for office / desk working situations where you want to manipulate a screen that should be some distance from you.

All touchscreen computers should have a second input device such as a mouse. In a laptop that means a touchpad equivalent.