KDE Ark is a graphical file compression/decompression utility. It's not system app and does not require deep integration with the base system. It's a bit strange choice of apps to include to system image.
IMHO KDE delegates too much core functionality to apps. On macOS, I can press "space" while having a file selected and I get an instant preview. This sort of thing must not be delegated.
The recent update to 11 added libarchive integration with bunch of formats
Which goes completely against the kind of immutable and sandboxed system that KDE Linux intends to be.