I think a plain wireframe mode in 3d viewport wouldn't hurt. I'm fine with the Wireframe Lines Renderer,
but what if the user just wants to quickly check mesh resolution/topology and then go back to normal 3d view? Usually there's a hotkey or a viewport mode button for that kind of thing. Additionally, a wireframe mode may be used to control point selections. Such feature would really come in handy. What do you think?