It probably isn't giving you alternatives because it hasn't found any alternatives that are actually faster. Sometimes sitting in rush hour traffic on the best route is still faster than taking some alternate route, sometimes it isn't.
Why isn't Waze "sticking to" the Major Highways
here? The first route given using mostly Transcontinental (Minor) and W Esplanade (Minor) eschews a longer trip down Veterans (Major) for a route along Minors that saves one minute. The third route eschews
both for a route mostly down a Primary Street (Kawanee). How about
these routes, then — none of them uses Veterans (Major) significantly or the Interstate
at all. The primary route relies on W Napoleon and Cleary, both minors, and the others use primarily some combination of Primary Streets and Streets.
The route between your home and your workplace is a short, straight shot down a Major Highway. It isn't even just your area, it's your origin and destination that define your experience. The three routes you get are the three best routes; I don't see any other route that would be better between your home and your workplace.
Here's a route in your area where it would certainly be possible for Waze to "stick to" the Major Highway if it wanted to, but instead it takes you on a 1 minute shorter route down a Minor Highway.
Here's another where Waze would be perfectly justified in "sticking to" the Major Highway, but it doesn't — the primary route along mostly Minors saves one or two minutes above the two alternative routes, both of which combine Major and Minor.
So yes, I believe your experience is simply different. I would expect a similar experience for someone who
lives and works here and here. But even still, routes from one point near a Major to another point near the same Major
don't always "stick to" that Major and might even ignore it depending on Waze's traffic data, which is pretty good here.
If you haven't looked for other routes, how would you know if better routes actually exist? Keep driving and see what happens. Take some of those routes you think are better a few times if you think Waze should consider them. Take note of whether or not they are actually faster than the three routes Waze suggests. You said you don't have a huge Wazer base in your area, so make that data yourself. See what happens. I don't know that anything's going to change on your route, but you won't know unless you try.