I sometimes I think Waze is sending me on an exploratory missions, giving me a sub-optimal route just to learn the current conditions along it.
s/users/queries/.
I wasn't saying this never happens. I myself deviated from Google Maps just yesterday. But, like, this was probably the only one out of my last 10 queries. And I was trying to say this is a minority of the queries.
I wouldn't be so sure about that. I have seen many different users intentionally deviate from the suggested route because they know more than Google about what is best for them (or at least they think they do).