I tend to think that you are wrong on this. I think uchihas, need to have some skill to copy a jutsu. Meaning all uchihas cant just go "sharingan" and instant copy it. They need to be skilled to be able to copy it correctly. If it was that way, then it wouldnt have taken sasuke so long to copy chidori(several weeks). So a uchiha would be able to observe how the tech works, but they would have to have the skill in shape manipulation to be able to use it. But it is probably likely it drains alot of chakra as well.