Sure, why would it not be possible. Intellij and Eclipse also implement all their language support in plugins so why wouldn't VSCode. But the thing is this is

Sure, why would it not be possible. Intellij and Eclipse also implement all their language support in plugins so why wouldn't VSCode. But the thing is this is all hypothetical - it is possible if somebody invests those thousands of hours into it. But so far it did not happen for most languages and Intellij IDEs are still vastly superior to VSCode for e.g. Java, Python or C++ development.