>Well, offline VSCode is a glorified browser as well.
Not really, it may use electron for the front end, but a huge amount of what makes vscode useful and fast is the native binaries that power all of its functionality.
What are those native binaries? I know that VSCode ships with ripgrep, but that's the limit of my knowledge. Those binaries probably could be compiled to WASM to make VSCode fully run in a browser too.
The Language Servers that power all of the intellisense and syntax highlighting and stuff are all native code. As are the compilers and everything that make VSCode more than just a text editor.