Glad to hear that. How about we change the name to QueTee so that we still can everything starting with a Q and people finally pronouncing the name right? :D
I would rather recommend to stay with the name but add a prefix such as "Free Qt" to demonstrate that it is still and will remain a robust Qt branch doing without incompatible changes and focussing on the essentials. I wouldn't even mind to start with 4.8.6, but also 5.6 is OK (the last LGPL 2.1 version). Work should concentrate on stability, compatibility with relevant platforms and finer grained modularity using a standard build system (such as modern cmake). Rewriting everything just to worship the "modern C++ god" is a no-goal from my point of view.
Nope as a QML developer 5.14 is bare minimum because of the many changes like proper 4k scaling support, Splitview, Table support, way better Android build, usable Qt3d and many quality of life improvements.
Are you aware of Dart and Flutter? I also used Qt on Android and iOS once. Won't do it again. A lot of linking, deployment and licensing issues to use something where by the end of the day I have to take care myself that it meets the platform look and feel. QML/Qt Quick was a nice idea when Nokia and others wanted to establish a common mobile platform based on the Qt framework. Today for scripting/mobile UX focussed developers there are much better options.