Hi doma,
Yes. It was unfortunate. This is one reason I also mentioned the influence of Ptolemy.
Kepler had one foot in the astrological/mythical world and another in the mathematical one. He was convinced that somehow he could fit the various kinds of regular geometric solids inside the orbits of the planets and wasted years trying to fit them. He did so because he was looking for the mathematical elegance he presumed a creator must have imposed.
Unfortunately, the geometries don't quite work the way he wanted them to.
It's a mistake to become excessively romantic about nature. It tends to bite.