[2020] Why anti-cheat software utilize kernel drivers; a view from reverse-engineering experts

Originally posted by SouvenirSubmarine

The Realtek HD Audio Driver package is present on all Windows machines that feature a Realtek sound card, rendering all of them vulnerable to attacks. Exploitation, however, requires the attacker to have administrator privileges.

Isn't this is exactly why I should be wary about granting software like Vanguard administrator privileges?