You can't compare it like that. It's not a light version, it's an editor.
It is not just an editor. It has debugging capabilities and is extensible. Also runs on Mac and Linux and now open source. In some aspects it is much better than heavy loaded old VisualStudio.
It's not an editor, it's an IDE. Just look at the Python support they expect to add next year: "full intellisense, debugging, profiling, pkg mgmt, unit test, virtual env, multiple interpreter, Jupyter, etc. support.". All that in one program? You can't tell me that's not an IDE.
Well, yes it's a completely different bit of software.