you can do all of this in Qt, too. Without the overhead of the inner platform effect.
Note: I don't use VS Code or any other JS editor, I use emacs. But I can definitely appreciate the major benefits of the architecture.
both projects are open source if you care to verify
its a simple checkpoint and pretty much every actively developing project does this nowadays.
The whole experience is important. For many, it's more important than the individual 'feature' of being light on resources.
I currently ignore the fact that VS Code is 'heavy' as text editors go, because it's so much lighter than e.g. Visual Studio, leaving me much more RAM free for some of the code I'm running to gobble up and use for its own ends.
I'd prefer lighter 'weight' - in terms of RAM and CPU usage - but I'm not tempted back to Sublime yet.
BTW I'm a vi person, so I'm using vi keybindings in VS, VS Code, Sublime - and anywhere else I can do so. I love Vim's speed, but I can't Get Stuff Done in it like I can in more modern editors. I mastered the keys, not the inbuilt windowing system, scripting language, etc.
I really believe that if you find these vim plugins useful you don't really use vim all that deeply. that's not a criticism, just an observation.