Indeed, I have been using Arch as my primary system for years. Nowadays so called "stable" distros dont make much sense to me. Though to be fair, I used Gentoo before arch, so I guess they never made much sense to me
)
And Qt has a serious quality control problem. I cant really do much about using Qt in calibre since there is too much code that depends on it, but I am really reluctant to use it on anything new.