This hasn't been the case for a few years. PyQt has been excellent from the beginning of Qt5, and as of 2018 or so the Qt for Python binding is also in very goo

This hasn't been the case for a few years. PyQt has been excellent from the beginning of Qt5, and as of 2018 or so the Qt for Python binding is also in very good shape. I code cross-platform in C++ or Python primarily, so maybe that's why Qt is such a good fit. All the frequent version incompatibilities of Gtk3 just made me not really look into it any further.