These keys allow you to replicate all aspects of the mouse, including wheel movements and different clicks and buttons, such as the back and forward buttons.
These keys can prevent mouse usage and help to reduce wrist movement. However, to do so, we strongly advise you to adjust the settings and the response of the mouse keys in terms of acceleration, speed, and maximum speed.
If you want to quit using the mouse completely, you will have to test the different settings to find the ones that better suit you. In those cases, the advice of the community will be priceless, so go ask them.
What are you waiting for?