6.17 seems OK. That's what I'm still on as I often don't update (anything) unless there are bugs or security issues fixed that affect me. It's vanishingly rare that there are new features I want. Updates to Thunderbird, LO Writer, Firefox, The Gimp etc have either completely disabled features I use or broke features I use. Though The Gimp and LO Writer have workarounds (different scanner plug-in and no floating toolbars in LO Writer). Then there is Windows, downhill slope after 2003 with Vista. Crazy Win8 & Win10. People expected to buy Win7, when it's only a fix of Vista. So December 2016 I stopped using windows for everyday work.
Lack of testing, Incremental and rapid updates are to blame. Firefox is one of the worst. At 114 on my system and less functional and worse GUI than version 50 or something. Thunderbird after V91 is unable to use system theme and instead uses braindead Firefox style. Mozilla is clueless about GUIs.
And almost all issues with Calibre have been forced on Kovid by stupid QT design decisions or Browser Engine decisions outside his control. It was a bad day when Nokia bought Trolltech (QT), though since sold again. Most of the top talent left.
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