Hello @AKazak,
Here is a similar discussion that shows that if we skew the axes, the path will not be perpendicular.
If we look at the axes’ scales, it is obvious that (1) the w axis is longer than the b axis, but (2) the range of w is smaller than that of b. Therefore, before we say that it is not perpendicular, we would need to correct such effect first.
Cheers,
Raymond