Cliffhangers are one of the best ways to end an already amazing movie. More often than not, cliffhangers literally left audiences at the edges of their seats and wanting more as soon as possible. Because of this, cliffhangers are inherently frustrating. They lack resolutions, and force viewers to wait for a year at the least for answers.
Source：https://www.cbr.com/movies-best-cliffhangers-fans-frustrated/
