Some do, while I can't speak for the emacs community the (n)vim community is very active and engaged. There are modern vim plugins for nearly everything. The developers using VSCode tend to be developing on overpowered workstations where the difference is less noticeable. It doesn't mean it isn't wasteful. At some point we'll hit some upper bounds as an industry and have to rethink how we develop software, the trend back towards statically typed, compiled languages like Rust, Swift, Go are already leading us in that direction.

Edit: a word missing