Einstein's relativity is undoubtedly correct in its basic tenets. But there are some finer points which were or are still up for debate. Frame dragging is one

Einstein's relativity is undoubtedly correct in its basic tenets. But there are some finer points which were or are still up for debate. Frame dragging is one example. There were several theories offering slightly different predictions in that field (that broke down to perfect identity for real-life situations), Einstein's GR being just one of them. So, in physics it's like this: trust, but verify.