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slint
Slint is a declarative GUI toolkit to build native user interfaces for Rust, C++, or JavaScript apps.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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 is leading work.
I'd also like to mention Slint: https://slint-ui.com It is a modern alternative to QML.