Way too simple 
there are users who want a dedicated switch for always highway and never highway. Not even GMaps has something like that 
Understanding how the fastest route with and without highways works in navigation or in Kurviger couldn’t be successfully conveyed in this thread. Best not to comment on it anymore.
However, something about the user interface isn’t very logical. Many say that you should set as few avoidances as possible, and then Kurviger will choose the best route.
Why do these avoidance settings even exist if they make the routing so terrible?
Just leave it up to the user which avoidances should be taken into account for a section of the route. From my point of view, avoidances belong in the curveness settings.
This is getting off-topic.
You didn’t understand.
That solves your problem.
Avoidances only apply to the entire tour.
Between two points you’ve set, road types are also prioritized differently due to the curviness.
If I remember correctly, it’s the same with calimoto, except that you just can’t generally exclude certain roads.
And that answers your question as to why use avoidance then. Because it’s for the whole tour!
I never want to use a ferry, an unpaved road, or buy a vignette! That’s why these avoidances are active.
Everything else is basically modeled.
The assumption that the routing becomes so terrible is, first of all, subjective. Basically, it’s also easier if you show an example, meaning share a shortlink here, so that it can be explicitly explained. If I remember correctly, this has also been asked a few times already.
If you share a link, please also do so in the correct post.
That’s what Kurviger tries to do along the entire route anyway!
However, you have to specifically look into how curviness levels affect things and, in a second step, add any avoidances. Only then will it make sense and you’ll understand how to apply the options more appropriately.
@Ilias
Now something fundamental regarding the posts:
It doesn’t help to post your topic in multiple threads if the actual topic gets derailed as a result. Furthermore, at some point it becomes very tedious—also with regard to other users—to find your way around the subject of the thread title.
If you are interested in having the curviness and avoidance for a specific route broken down for you, please stick to this thread.