Disney have done this multiple times with their rides, it's not particularly a Universal strategy. Universal also messed a lot of people around when they opened Hagrids ride before it was ready. Many days people queued for hours and the ride would go down. After going down there was little to no communication to guests and people weren't happy. Sometimes these things work for you and sometimes they don't, both parks have records of getting things spectacularly wrong and spectacularly right.
This still happens with RotR.