VSC is an "redefined" and high hackable (largely thanks to the rich nodejs ecosystem) editing environment which you can do everything as you like. So, to pin it into an editor or an IDE makes less sense.
more technical imagination: the project lead Erich Gamma has long history works in the field of Eclipse and definitely knows the importance (and pain) of the code editing to a programmer. Then, I (and we) can expect VSC would go beyond the Eclipse and hunt the heart of coders from other IDE products some day:)
final shameless insert: recently I release an extension to provide Swift editing environment[1] to try to bring Go/Rust like experiment for Swift server side development. Now it works for both Linux and macOS.(I hope to investigate the possibility for windows 10 WSL after release 2.0 coming soon.)