Well, I wrote "practically no one", not "absolutely no one"... Anyway I'm sure some purists have added the cap, but 99.99% of post-'85 Ric owners were happy with their basses and never complained about unwanted mid scoop nor felt a need to correct it.
The cap, in my opinion, was a historic mistake that took way too long to make right. It resulted in so many altered, sometimes butchered, 4001 basses. It also gained Rics a reputation for being trebely, clanky one-trick-ponies - anyway that was the widely held misconception. Which they really aren't, once you bypass the cap.