After a few months of on and off work, I have pieced together a Blender-exclusive creation suite (The MCCCS) that can build most kitchens and bathrooms in 1-2 hours, with systems in place that can automatically change between cabinet door trims, countertop profiles, window sizes, and stone materials. A standard kitchen built by hand can take even a talented artist 3-4 hours to build, with no room for changing between the above-mentioned components for a variety of visual appearances.
You can find the MCCCS here: https://www.turbosquid.com/FullPreview/1926203