This reads like the sort of academic engineering that I hate working around. You ask great questions for research, but the truth of the matter is quite simple.

You can just open both editors next to each other and ask how they are. For me, it's trivial to see that vim is at least an oom faster than VSCode. I don't need to profile or show test coverage. I can just use it and it works. Even if they were about the same speed, the less-than-perfect vim mode implementation always takes too much time out of my editing flow.

Occasionally, an ide will have such a great curated experience that I'll use it for something specific -- but the general case is a no contest for me.