I am stumped by that person's comment. Waze is superior in every single way for navigation:

Faster adjusting to real-time traffic, better navigation UI, more importantly tells you where polices are but also other various things that are good to know beforehand.

Google maps is still useful to pre-plan a route, get information about businesses, restaurants, opening hours and just better overall building information with street view and such, but I'd never go back to using maps for navigation unless they do exactly as waze does.