Debian and Arch are not different operating systems. They share the same kernel and largely the same userspace. Debian just ships with older/buggier versions of everything, in the name of "stability".
And hey suit yourself. You just aren't going to get support for a version of calibre that is totally out of date. And yes the web interface is never going to be as efficient to use as the native one, becaause the former is optimized for touch and small screens and the latter for mouse+keyboard and large ones.
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