I just find it hard to take workload / storage space arguments seriously when every other modern game can have high / low graphics settings with no issues. Usually by having one set of textures/models that is upscaled/downscaled as needed based on your settings.
Edit: I also know of a mod that adds higher resolution fingers/toes for hundreds of items, so I went and checked the file size on that. It is a whopping 26.5 MB, so no it's not a storage space issue.