I think some people (including myself) prefer to get something barebones and add plugins/addons/extensions to get just what we need.
I can run some monolithic IDE like Eclipse that comes with everything I need plus a bunch of stuff I'll never use or I can take Sublime Text/vim and add just the right combination of packages to fit my needs.
You have also described me; I do not feel the need to call Vim an "IDE". I even appreciate that it can be turned into an IDE (though I do not do this: I currently prefer to use separate tools), but it doesn't become an IDE until after you've added enough plugins to have covered the functionality of at least "compiler" and "debugger". In essence, I'm confused by your response, as it seems to indicate that "because some people don't want an IDE, they choose to call things that are not IDEs using the name IDE".
I can run some monolithic IDE like Eclipse that comes with everything I need plus a bunch of stuff I'll never use or I can take Sublime Text/vim and add just the right combination of packages to fit my needs.