Something that we still use today that has been unchanged. Wheels are unchanged. I mean even bicycles still use spokes.You have to define what the technology is used for.
The wheel is great, but for what? Travel/moving goods? Well air travel is far better than wheeled travel
Toilet paper is probably perfected for its use, but the use of a bidet is a different technology solves the same problem.
Nothing has been perfected because new problems can arise or new ways of solving old problems can be thought of with different methods.