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Using H3-py's h3_to_geo_boundary a WKT linestring (via shapley polygons) can be generated.
When later visualizing the hexagons, why are they distorted? How can this be fixed?
To my best knowledge, H3 works in EPSG:4326. As you can see on the plot, the base-map coordinate system is also set to 4326. And QGIS also interprets the CSV of WKT strings as 4326.
Why do I see the distortion? How can it be fixed?
The definition of EPSG:4326 is simply just a representation of the WGS84 coordinate system which is a 1:1 mapping from the spheroid to an XY plane.
And, while WGS84 is the correct spheroid for h3 geometries, you need a conformal map projection if you want to preserve the hexagon shapes.
Shown below is a reference image taken from QGIS using EPSG:3857.
