You're not completely wrong, but I think this overstating things by a lot. I'll grant you the containers for example, but you can generally use STL algorithms w

You're not completely wrong, but I think this overstating things by a lot. I'll grant you the containers for example, but you can generally use STL algorithms with them. And plenty of old ways of doing things have left modern Qt-based codebases and moved to more modern ways of doing things, including a fair amount of moc macro usage (and yes, you can remove the moc these days, but it has different perf characteristics - cf. the verdigris project). The community around Qt is pretty active at adopting modern C++, e.g. imho https://github.com/danvratil/qcoro https://github.com/danvratil/qcoro is leading work. I'm glad that folks clamor for keeping things fresh, but every 30 year old project is going to span a few minor revolutions along the way.