When adding a bunch of simple products to a configurable, do these simple's need the description's adding?
Say i have a config for a shirt with 6 sizes and 12 colours you can imagine how many lines that would be, would each one need a description etc as i don't see how it displays when using a configurable.
No you don't need to add descriptions to the simple products. They won't be displayed on the frontend.
Only the description of the configurable product is displayed on the website