Hitch, I did notice with Kindle Previewer that some “devices” applied some of the styles, whilst others did not. Since KindleGen produces both KF8 and mobi “format” wrapped inside a single container called mobi, it seem that the program figures out which from what and in this case that you and JSWolf state, merges the external stylesheet with the HTML. Whereas ePub is basically zipped HTML and CSS files, I get the distinct impression that (mobi/KF8) is a compiled end-product - similar to a C source file and the resultant EXE after compilation.
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