Sometimes abstractions make performance better too. We can’t all be experts of everything so using a well-optimized library is a boon.

Even beyond the library scope. I suspect most complaints in this regard are around electron/web tech, but a well developed modern C#/dotnet application is plenty fast for most use cases and you get the productivity of a high level GC language with it. Go has even a smaller footprint.

There's plenty of value in the abstractions. It didn't all start to break down until we collectively decided that javascript + chromium is the only way forward for literally everything.