These kind of Vim emulators are not really providing the full vim experience. Some come close (like Emacs Evil Mode), but most just don't. Most are just scratching the surface of stock vim.

Not even the vim experience when using plugins, just stock vim.

I tried ideaVim and while I do not remember what my specific problems where, you can read their ReadMe for a glimpse that they have a lot of issues still.

Even IF they would provide a decent enough vim emulation, why use something emulated when I can have all the IDE features in Vim itself.

Also: Vim plugins that provide IDE features are purposefully build with the way vim works. Providing advanced IDE functionality in a Modal Editing environment. This can not be said about an IDE with vim emulation. As far as I can see they implement those features as ":action <actionName>" which is so much worse then what vim can do.

IntelliJ + IdeaVim is simply a worse Text editor then Vim despite being significantly more bloated and slower and I would even say that Vim with plugins is a much better IDE as well (while STILL being less bloated and faster).