Though not distro wikis, there's also a wealth of information on the Linux documentation site and the kernel newbies site. A lot of useful information is also present on Stack Overflow. I just wish that they hadn't shot themselves in the foot by alienating their contributors like this.
Other documentation sources like BSDs' are a bit more organized than that of Linux's, thanks to their strong emphasis on documentation. I wish Linux documentation was a more integrated single source, instead of being scattered around like this. It would have required more effort and discipline regarding documentation. Nevertheless, I guess that I should be grateful for these sources and the ability to leverage them. While I do rely on LLMs occasionally for solutions, I'm not very found of them because they're often very misguided, ill advised and lack the tiny bits of insight and wisdom that often accompany human generated documentation. It would be a disaster if the latter just faded into oblivion due to the over reliance on LLMs.
Many other distributions fragment their knowledge across mailing lists, forum posts, bug trackers, and random blog entries. That worked when search engines were good at surfacing niche technical content. With current search quality, especially the SEO noise layer, the absence of a canonical, well-curated wiki becomes very visible.