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Fuzzi - QT is used in a variety of application systems: desktop, phone/tablet, and embedded. The only people who can make a judgement that something is better for
everyone are the QT developers.
On the more general point:
- many (most perhaps) calibre users would regard its interface as one of the most flexible around, e.g. how many other products allow the user to define the content, let alone the order, of the main context menu;
- in the 6 years I've been using calibre there have been a number of people who have 'complained' about its UI, few if any of them have done anything constructive to address their complaints, even though calibre is open source;
- calibre has over 3 million active users, changes to the UI invariably generate 'what happened to XXXX' questions, not only just after the change is made, but years later, like when their Linux distro gets around to updating calibre.
BR