I can certainly imagine developing a complex extension intended for publication in the marketplace can involve a very different experience. I had in mind only

I can certainly imagine developing a complex extension intended for publication in the marketplace can involve a very different experience. I had in mind only the kind of extension a user might write for personal use, which may often involve adding some simple functionality (usually some event listener, e.g. intercepting auto-completion to do some filtering). I find it very convenient to be able to change the code and have the changes instantaneously reflected in the editor itself (rather than some sandboxed environment) and wish it were possible to do the same in VSCode