HMVC into CI itself without third party codes

If CI doesn't implement HMVC it's a bad sign for it's development path. Every single company I've worked for in the last 5y has used HVMC in their frameworks, you're really doing a disservice to yourself at this point by not using it.

And I'd guess those companies' development has problems exactly because of HMVC. Few people get it right.

I think you should run another poll. After reading some of the other posts I too took this to mean assets contained in a single folder, not controllers calling other controllers. That usually is bad design.

If we had a folder structure like this;

/controllers/main/Main_controller.php
/controllers/main/views/post.html
/controllers/main/css/style.css
/controllers/main/js/module.js
...

We could bundle modules, the default folder structure does a poor job of making code reusable. That's what I voted 'Yes' for. You can do this now without editing core files, the only thing you can't change is the controller's file name.