jonycp wrote:So if I demonstrate to Waze that my route (my drive) is faster by driving its slower alternate route a few times, it should pick this up and offer my drive as a possible route?
In simplest terms, yes. As Andy already noted, the preferred route must be checked to ensure no missing segments, incorrect road directionality, restricted turns, etc. All manner of possible problems could exist.
And I have personally watched Waze figure out the best way to go after I've driven the recommended route. And it wasn't just one recommended route: after I took one route a few times, it tried another route, not the ideal route, so I took that one, both directions, a few times. It took about a month of various different routes to get the ideal one working.
Now, to this day, there is still a route I prefer to take which is slower than the fastest route. I know it is, but it doesn't go over a mountain which is often slippery with ice or snow and unexpected accidents. So, every morning, I do still need to select my preferred route from the alternate routes list.