They always seem to force alternative routes regardless whether there are any.

I regularly see “alternatives” which are just taking a turn, doing a 180 in a roundabout and reentering the same route as before. Because why wouldn’t I just waste 10 mins just for fun?

The best alternatives are the ones you find zooming into the map. The software knows it can’t recommend anybody take them because they’ll immediately become slower than the main routes.

Also never seen the roundabout 180