Those features aren’t enabled nor integrated. They’re added to Vim at its extensibility points.
And that has to be just about one of the pettiest to distinctions known to man.
It's still built to write code. Yes text is code, but vim is not a text editor in general,. It's made for programmers, nobody else is crazy enough to learn such obtuse syntax or want to have a developer with a scripting language built into it.
The features are in the editor. They are integrated with the editor. Yes, it's through plugins, but they're still part of the editor instead of part of some different program.
The word integrated literally just means you don't go into some other program to run your build.
It's an integrated environment for development.
It's an IDE!
It has debuggers.
It has syntax highlighting
It has compiling.
Even if you have to install them as plugins, it's designed to be doing all of those things.