I think you are pretty accurate in your assessment of the target market. The way I'd phrase it is Sublime Text, with VS Code extensions and modal editing. I don't imagine the target users want anything beyond the modes and text handling, particularly the way Vim handles tabs and splits.

This is based on me personally. I use the vim plugin in VS Code. I wish it was closer to real Vim keybindings, search etc but I want to keep the overall handling of tabs and files.

So Onivim is very interesting to me, I have purchased it, because it looks like it will give me the combination of speed, plugins and conventional editing experience that I'm looking for.