Thats a good point with a great example.
I think scaling the noise function vertically can solve this, specifically sampling the noise function from a larger y-value, which will in effect squeeze the map vertically to show more horizontal gaps.
We also have a ticket to separate the mud and the flimsy walls from the same pattern, this way they will less likely block off the entire track like in the first example.
What do you think about the horizontal length of mud pits, do they feel too long/short in the horizontal axis?