I hesitate to post this as an Answer, because I don't have any direct experience with Kali (or with Arch Linux, for that matter), so I'm not the target audience here. That won't stop me from speculating a bit, though.
Beyond fra-san's point in the comment about the unanswered percentages being similar (I see ranges from ~28% for Debian, to ~35% for both Kali and Arch, to ~36% for Ubuntu), I think Kali users had a rough start at Stack Exchange. In 2015, when we accepted their redirection from Ask Ubuntu, there were already worrying signs: "so we can add them to our ignored tag list" and "I don't entirely understand all the terrible Kali questions we've been seeing lately". I see there are nearly twice as many deleted Kali questions than deleted Arch questions.
The story continued, with Why is Kali Linux so hard to set up? Why won't people help me?, saying "Kali Linux is a distribution for professional penetration testers who are already very familiar with Linux" and What should we do about Kali Linux questions?, saying "It's well-known that we have a quality problem in the kali-linux tag" and Splash screen test for kali-linux questions and Why are Kali questions hated so much?, and finally with Yet another Kali Discussion (Working Title) saying "I wonder if we can find a way, as a community, to direct people away from Kali without telling them "Kali is great!" and without requiring such opinionated responses".
I think what happened is that we got an influx of poorly-asked questions which then got downvoted, closed, and/or deleted, and also (I suspect) caused many users (potential Answerers) to ignore the tag.