When I combine faces in edit mode by pressing F, the vertices from the original faces remain. I then manually select all these vertices and dissolve them. As you can see in the example below the image shows 3 selected vertices that I can dissolve. The question is: Is this something that is required in order to optimize a model for a game engine such as Unity? The more complex the model the more of these vertices I find myself cleaning up. Is there an automated way to do this perhaps?