Note, I'm not saying that the more featureful editors aren't worth the trade off in performance. Just that there is a point where it wouldn't be a good trade. I use both Atom and VS Code (trying to figure out which I like better) for my more complex projects (a lot of files/deps/etc) that I can test locally. But, fall back to vim for quick changes on single files and whenever I'm testing-editing-committing on a remote machine or VM. It's a feature that vim starts instantly, wherever I am. It's a feature that it's still fast(ish) even over a slow(ish) network. A killer features in this case...I can't use Atom or VS Code, at all, on a remote server over a slow link. Literally impossible to do.
So, why not compare a bunch of different editors with wildly different capabilities, if it provides insight into the relative performance and sizes of the editors? And, to be fair, some of the fast/light editors are roughly as capable as VS Code, Atom, or Sublime. vim and Emacs are plenty powerful editors with huge ecosystems of additional functionality. I understand the appeal of a good GUI, and the bigger/slower editors do have superior UI to vim or emacs, but it's just one feature of many we can compare.