Module support?

I'm a huge proponent of module use, myself. But also very much against the "controller calling controller" method that WireDesignz' code uses due to the possibility of a confusion of what "$this" means in the different contexts (since "$this" is simply an instance of the calling controller).

It seems to me you could use a library from another module to get the same results without the potential issues with controller calling controller.

thats the reason why we do 95% of our stuff in our models - even form_validation; We pass an prepared data object to the models and let the model do all the stuff- and pass just the data through the controllers who decides which data they want
but there are simply cases where its quite comfortable to load a module in a controller
In our system we've by now about 250 controllers and some of them put out different formats (like pdf, csv, doc, xml etc.)
a last example should illustrate what i mean

PHP Code:

public function pdfExport()
{
    $this->load->model("onlineshop/OnlineShopCategory_Model");
    $this->load->model("shopbackend/SaleItems_Model");
    $mainCategory = intval($this->input->post("category_type",true));

    $objCategory = $this->OnlineShopCategory_Model->getCategoryFromId($mainCategory);

    //print_r($objCategory);
    //die;
    $objPDF = new PDFExport_Object();
    $objPDF->setHeaderTypeToHtml();
    $objPDF->setFooterTypeToHtml();
    $objPDF->setDefaultFont("arial");
    $objPDF->setConfigVaues("margin_top",22);
    $objPDF->setConfigVaues("margin_bottom",22);

    $arrData = array("objCategory" => $objCategory);

    $objPDF->setPrintHeader($this->load->view("shopbackend/sale-items-header",$arrData,true));
    $objPDF->setPrintFooter($this->load->view("shopbackend/sale-items-footer",$arrData,true));
    //$objPDF->setPrint
    $objPDF->setPDFFileName("abverkaufsartikel-".date("Y-m-d").".pdf");

    $objCategoryWrapper = $this->SaleItems_Model->loadItems();
    $arrMainViewData = array("objCategoryWrapper" => $objCategoryWrapper);
    $objPDF->setHtmlText($this->load->view("shopbackend/sale-items-pdf-export",$arrMainViewData,true));

    modules::run("PdfExport/createPdfFromHtml",$objPDF);

    

} 


Again - of course i can use a library but i don't want to because of the reasons i mentioned in an earlier post.
Also, i don't want to make a religious thing out of that (my posts are just my opinion), but i really want the freedom to call a module where- and whenever i want. 
If i don't have that, i think its use- and pointless to integrate a module based system in CI 4.