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Thank you! This technique is not only suitable for variable profile thicknesses. Basically, all dimensions can be adapted by a B-spline profile. This also allows, for example, a continuously variable fillet radius of a cross-section.

... please have a look at CurvedShapesWB => a similar intention like yours.
https://forum.freecadweb.org/viewtopic.php?t=36989
It seems to have some trouble with FC.20 (or it's me? => I had to do workarounds by Ruled_Surface).
But both tools could learn from each other.

Yes, that is correct. In fact, the Curved Path Array command from the Curved Shapes WB is great and was my main inspiration for the macros presented - appreciation to the developer of this WB. However, according to the documentation, "the hullcurves should lie on or parallel to the XY- XZ- or YZ- plane". If I understand this correctly, for example, a parametric bench like the one in the following figure cannot be created with the Curved Shapes WB commands. With the help of the parameter mapping, the profile can not only be scaled, but also changed in its shape, as can be seen in the picture.

Really cool.

... a front fan (with no mathematical base - only by eye and feeling) showing the potential of this tool in a technical view.
With blade twist by placement angle (not yet velocity triangles !) on additional CurvesWB profile tool.
Having some doubt, that the result of blade thickness macro has parametric effect after editing the curve ???
The CurvedShape tool does it better, but there is no "circular alignment" of the profiles possible.
The trick to use birail Bspline control point positions is very useful.