If it works with the concept, I would probably allow it. But then voluntarily whacking off bits and replacing them with Cybernetics is a pretty serious step and will almost certainly come with all kinds of story complications. Breakdowns, first aid, cultural bias - your 7 will come with a price. . . .
Luke preferred the mechanical option to regrowing a natural one. Same with Anakin. It's the people without cybernetics that are the freaks. Natural bits stink too much of evil clones. Robots are the future!
I think his point was that neither individual chose elective surgery to improve themselves, and Maelora has a very good set of thoughts about how droids and cybernetics are not looked upon well by the general populace.
Edit - That and Vader is not the best person to reflect the ideas of a culture.
Edited by FangGrip