That’s a good question, and there’s only one—rather poor—answer to it: Because I don’t have any need for it myself.
The fact is that, for decades, I’ve been creating everything from architectural plans to novels using LaTeX, and I almost always use KOMA-Script for that. For years now, however, KOMA-Script has been able to do everything I need. Furthermore, the number of documents I create is steadily decreasing; or rather, I’m creating the same types of documents over and over again, just with different content. As a result, I can no longer test new features in KOMA-Script sufficiently well in my daily work. Even if I use the current beta version of KOMA-Script for all my documents, I’ll therefore hardly find any new bugs.