Yeah, I don't know how much experience you have with Qt but widgets are far from being "finished". There's plenty of things that could be improved if their focus wasn't on Qt Quick.
The use of Qt Widgets is declining (albeit slowly), as stated in http://blog.qt.io/blog/2019/01/14/qt-customer-survey-2018/. You're telling me that they're going to support two different technologies that do the same thing without giving preference to the newer, technically superior one?
Qt Quick is intended to replace Qt Widgets, but it isn't currently at a stage where that's feasible -- hence my apprehension.
From the first post, I assumed the commenter meant something like, "in Qt 6 QWidgets will stop working", which is insane.
Maybe Qt is full of potential in your country? Perhaps Qt is booming in your industry? I haven't had those experiences. If my sentiments are misplaced, just inform me with reasonable arguments and I'll gladly change my view. Telling me that I'm just wrong doesn't help anyone.
I hate working with web frameworks but the network effect is real and not in favor of Qt. Perhaps there was a time when Qt was thriving and innovating, but right now it seems like it's just a bunch of fortune 500 companies paying 1-2 Qt developers to maintain legacy software.
Sometimes I wonder if there is an alternate universe where Qt won "the battle" and made the world a better place. Sadly for us, that didn't happen here.