@Moritz-Geschke Road network is very up to date! 
Traffic information is quite accurate but not as accurate as Google as they use their own phones to track users 
We do use traffic information (when enabled) to determine the fastest route. We however do not actively suggest (faster) alternatives while driving. That is simply a design choice for now and we do have it on our backlog.
Regarding routes with waypoints, traffic is barely a factor as distance between waypoints is often not large enough for congestions to cause a different route than planned. When driving pre planned routes, with waypoints, staying on the planned route has a much higher preference than saving a minute or two.