Last time that I tried QT was a huge pain compared to WPF or other solutions, admittedly something like 5-6 years ago. And it was proprietary and it needed a licence. With all my good will I find quite difficult to believe that now PyQT is the silver bullet to write all UIs. For sure it's not for me given that I find python a pretty average language with the huge handicap of duck typing (and before someone starts, yes, I'm aware of the 'type annotations')

> Last time that I tried QT was a huge pain compared to WPF or other solutions, admittedly something like 5-6 years ago.

Shrug, I found it much nicer than anything else I'd used, but I've never used WPF (which is single-platform in any case).

> And it was proprietary and it needed a licence.

Neither Qt nor PyQt is proprietary in the usal sense of the word (nor were they 5-6 years ago). If you're using a non-standard definition it would probably be more productive to use a different word.

> For sure it's not for me given that I find python a pretty average language with the huge handicap of duck typing (and before someone starts, yes, I'm aware of the 'type annotations')

I'm a huge fan of type systems. I wish I could find a UI framework that's anywhere near as nice as PyQt for an ML-family language.