This is the painful truth, isn't it? IMO The next best cross-platform GUI framework is Qt (FreeCAD, QGIS, etc.) Qt6 can look quite nice with QSS/QStyle themes

This is the painful truth, isn't it? IMO The next best cross-platform GUI framework is Qt (FreeCAD, QGIS, etc.) Qt6 can look quite nice with QSS/QStyle themes, these days, and its native affordances are fairly good. But it's not close. VSCode is nice-looking, to me.