To implement something simple in VS Code, you have to write an entire package, or put out a PR to one. To implement something simple in atom, you open up your init script.

To change a bit of css in code, you have to write an entirely new UI theme. To change a bit of css in atom, you open up your stylesheet.

Vim mode plus is significantly better than VSCodeVim, both performance and feature wise.

I will freely admit that VS Code has better IDE features (especially out of the box) than atom does (built in terminal, better autocomplete, better LSP support).

But to say that VS Code somehow obsoletes Atom is misguided. Atom is exactly what it bills itself as: A hackable editor built by github.