If Qt provides useful or not highly depends on what your applications are doing. If you just want a webbrowser where you can display a page with your HTML, JavaScript and CSS possibly enriched with C++ components then go ahead, Qt's WebKit will handle all that. But if you want a real port of your apps to desktop then WebKit is of not much use to you.
QtQuick 1 is deprecated in Qt5. However QtQuick2 is 99% compatible with QtQuick 1 so QtQuick 1 code should work fine in QtQuick 2 once you update import statements.BTW - is Quick1.0 considered deprecated or is still developed alongside Quick2.0 ?
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