This might be slightly off-topic, but still I'll give it a try, and other TeX-users might be interested as well.
Consider this minimal example:
\documentclass{scrartcl}
\begin{document}
\section{The heading}
Some text
\end{document}
It produces this result:
I find this incredibly displeasing. Especially when there are smaller, and more frequent subsection headings, the change between a serif and a sans-serif typeface strikes me as something I'd encounter in a school essay by a teenager just discovering comic sans. (I might be exaggerating.)
I know it is possible to change the section heading font to serif, and I like it, personally:
Is there a typographical reasoning behind the standard choice in KOMA-Script? Does my preference of serifed section headings count as poor taste or unsound typography? What are the pros and cons? (Or is it really just taste?)
Edit: I'm asking about a typographical reasoning because people claim e.g. that there is an optimal number of characters per line, supported by scientific evidence. Who knows, maybe there are experiments that show that the reader remembers more/less from a text typeset with sans-serifed section headings?
Best Answer
KOMA-Script's reasoning for that is:
(Markus Kohm, KOMA-Script guide, p. 94)
That being said, I like the all-serif version better, too. Although it is not exactly a gold standard in typography, Microsoft Word's standard settings have moved from mixed fonts (2003: Arial/Times New Roman or 2007-2010: Cambria/Calibri) to all-sans-serif (2013-2016: Calibri Light/Calibri). Maybe this indicates that this rule is not set in stone.