It’s only popular among programmers who wants an IDE not a programmable environment like emacs. Emacs attract scientists and researchers and people who write OS, compilers, DB, language specs, HPC systems and algorithms, design algorithms, performant OS utilities etc. VSCode attract web development crowd which mostly spend time on building web forms (making it dynamic using JavaScript with some framework may be react) on top of database schema or some document storage. Given this I doubt it will be anywhere as programmable as emacs.