Average velocity is limited as a description because it says nothing about:

1. Average velocity uses only the two endpoints and the clock. 2. The average velocity of an object does not tell us anything about what happens to it between the starting point and ending point. 3. A car could stop, reverse and speed up and still show the same average. 4. Instantaneous velocity is what fills in the story between the endpoints. _Source: OpenStax College Physics for AP(R) Courses 2e (CC BY 4.0), Ch 2 'Kinematics', sections 2.1-2.8_