Why only DRAFT ?
There are fundamental differences in the approach to draft rendering and photo realistic rendering (PRR).
In draft rendering you are more interested in the geometry of the object. In PRR you want an image that typically shows the object in its intended environment.
In draft render mode you typically expect interactive graphics, in PRR users are willing to wait a significant amount of time to produce that rendering that is just right.
PRR requires environments, shaders, materials and more. For each of these you need a dedicated editor. It is a massive undertaking.
Redway shines in its abilitities to do interactive work their roadmap includes support for sophisticated shaders.
LightWorks shines in the PRR results that are physically correct, include support for HDRI, ambient occlusion, IES light sources and many more.
I'm not sure what you mean with 'the Lightworks handles the "stupid" stuff" OK not the side what we want or need'
. One of the biggest limitations that we have had with the current version of TurboCAD is the ability to work interactively with files containing a large amount of 2D entities, or 3D wireframes. The Redway implementation is in response to many users experiencing issues navigating large files.