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Ah I came to comment this. Loved the GUI builder in Delphi, it's where I cut my teeth learning to program as a teenager. Since then, I've seen .NET within Visual Studio almost get to the same quality we had with Delphi in 1995, but still way off. Now that everything's a web app wrapped in something like Electron, it should be so much easier to have tooling like this, but yet we're all still building hugely complicate…
I personally think the real reason those types of tools seem less common and popular today is that people remember for example the reputation that Visual Basic programmers got (by the way, I was one). Basically, any really convenient RAD/GUI tool has an association with beginner programmers or even users. The last thing programmers want to be identified with is a user. Programming is manipulating cryptic colorful tex…
Having used QtCreator to build a medium sized GUI, it was a pain. The XML it produces is too unwieldy to manually edit, so that's out (though I did edit it a few times to overcome bugs in QtCreator)
The QtCreator GUI itself is very robust but if you want to do something that's off the beaten path good luck, you're gonna be doing a lot of trial/error clicking and iteration. There were times when everything was "right" in QtCreator, and the result didn't work...
I would much prefer to use something like QtDeclarative if I do it again. It's easier to tell the computer exactly what I want, and then get exactly what I want, when the language for expressing what I want is concise and small.