I agree, but this appears to be because there has not been a release since the AppImage was introduced in December 2024..
For my part - I like the concept of AppImages and self-contained software in general, like Fossil SCM, Micro editor, and single-file TiddlyWiki.
However, I don’t think AppImages would be a good fit for TiddlyWiki in the long term, as they are tied to X11.
My basic understanding is that we cannot unlock the potential of Wayland (like my hobby horse around better middle-click behaviour), if we use packages built as AppImages.