Qt is definitely not dead, rather alive and kicking. I've built my latest note-taking app[1] in Qt C++ and QML and it's been one of my best decisions. What the Qt Company need to focus on is hunting bugs (there are many of those) and reduce their license fee (at least for indie developers), it's just too expensive[2].
Have they given up on asking you 3 times if you are absolutely truely sure that you can comply with the license terms when you download the LGPL version?
With that attitude I can't recommend it to any entity that can't afford a full time legal team.
What's wrong with LGPL use? From what I gather, if you don't link Qt statically and don't modify Qt's source code, and your app's license doesn't impose restrictions that conflict with the LGPL, you are good to go. Most apps would fall under these criteria.
[1] https://www.get-plume.com/
[2] https://www.qt.io/pricing