I wrote Qt C++ for 7 years as an open source contributor to KDE. This reminds me of QtWidgets’ .ui files—custom XML files following a specific schema. Later, Qt introduced QML, which I personally found unintuitive, and over time I lost interest in Qt altogether. That said, I still think XML for UI definitions makes sense, and it’s understandable that some larger environments continue to use it.
Some of us are still programming in Qt using just C++ and .ui files. Never bothered to switch to QML. I wasn't convinced there were enough advantages to make it worth the effort.
I've been writing a UI framework for experiment automation and small tools using Qt Widgets with Python bindings (https://puzzlepiece.readthedocs.io) and it still works pretty well! I like the API, and it being immediately cross-platform is very useful. It does lack looks on Windows a little imo, but to be honest I'm not opposed to the utilitarian way the apps end up looking.
This weekend I asked Gemini Pro to create a Python Qt app (a serial file sender- something you'd use to send g-code files to a CNC machine or laser cutter). I did most of the dev on Windows but the app will run exactly the same on all 3 main platforms. Eventually I asked Gemini to extract the UI to its own .ui file, which it did. The resulting app worked better than the previous one I had coded myself (handling some various race conditions and other challenging issues much more quickly than me).
If I wanted, I coudl ask gemini to port the app to C++. (Gemini isn't the point here- that's just speeding up what I would have done on my own).
Nearly every widely-used commercial or in-house tool in the VFX and Animation sector of M&E are Qt based. The main difference compared to tradition desktop developers is the general attitude of design; the industry takes the stance of providing the same application experience across platforms, rather than trying to adhere to each platforms' UI/UX guidelines.
