I'd say that's more describing "without (library) dependencies". I'm not in the construction business, but I guess if you build a house from the ground up, tha

I'd say that's more describing "without (library) dependencies". I'm not in the construction business, but I guess if you build a house from the ground up, that means you're not building on top of some existing structure, but you might still be using prefabricated elements. I'd put the line here: whether ground work is used that was laid for editors, as opposed to general programming. If the thing that they are making (an editor) does not contain editor-specific prefabricated parts, then all the editor-specific work was still made from the ground up.