Microsoft Word has a feature that lets you enter a drawing canvas, Writer has nothing similar. It can be implemented a framework in which the Draw tools are offered to users, giving the possibility to create diagrams and use of connectors, and other design features that are unique to Draw. This avoids having to resort to another application, even if it is the LO Draw, to more elaborate illustrations.
Isn't it enough to Insert - Object - Ole object - Drawing?
The idea is to make things easier for the user, allowing it to save time . In addition, offer a built-in tool in Writer improves program stability . The ideal is to make available all the tools Draw in all LibreOffice applications. I really have trouble creating illustrations in Writer, precisely because of the lack of resources for this. I need to open the Draw and then import the illustration .
As Buovjaga said there is the OLE object thing. But you can also add a frame and insert drawing elements into that. Looks pretty much the same as in Microsoft Word. It perfectly WORKSFORME.