The main point of the story, that is, the hypothetical existence of multiple universes with all the lives you could have lived and being able to jump from one to the other, might be the basis for a good story. However, they decided to make a 100% wacky movie, with loads of visual effects, totally implausible endless kung-fu fighting, and very very little story. The sub-plots get also lost here: the gay daughter coming out of the closet to her conservative grandpa, the immigrant Chinese family, who had to adapt to the US and is struggling with the IRS. There's stuff here to tell a real story, and no need to flashy visual effects.

Add to this dubious production choices. Both main characters are portrayed by actors who are Cantonese speakers, but in the movie they are depicted talking in Mandarin to each other and in Cantonese to the grandpa. This won't impact English speaking viewers, but it only makes sense to add more confusion to the Chinese audience.