Think about this movie in a different way

Rating: 9/10 (8 March 2020)

I just watched Yesterday and enjoyed it. I agree with others that say those who are giving it low ratings are probably under 30 and have no clue who the Beatles are (no pun intended). It was fun and didn't need to be deep or thought provoking to be enjoyed. Some people are trying to make this some huge drama and it really isn't supposed to be. If you like the Beatles and want a movie that isn't just another reboot/sequel, you'll most likely enjoy this.
If you want to add a little more depth, please read more below, though take it with a grain of salt, it's mostly for fun.
---See it in a different way---
There are a number of things left unanswered through the movie, questions that couldn't possibly be answered unless this was a major sci-fi movie or a theory in quantum mechanics. What caused the blackout? Why did everyone forget about the Beatles? How were cigarettes never invented? It really raises some questions that never get answered, but I believe the answers are right there the whole time and because of one simple reason.
This movie is (unofficially) about the Mandela Effect.
When you get down to some of the basic questions in this movie, it becomes more clear that maybe the director wasn't just making a heartfelt movie about the Beatles and life without them, but possibly having some fun with the theory of the Mandela Effect.
The Mandela Effect was first truly documented with everyone believed that Nelson Mandela had died in a South African prison in the 1980s, but having actually died in 2013.
It kept bugging me how the movie never addresses the sudden disappearance of the Beatles (and soon other things revealed later) until you get to the scene near the end where Jack meets to two others that DO remember the Beatles. It's safe to assume that there are even more people who remember them, but they never made the connection.
The theory of the Mandela Effect is that a group of people remember an event or an item that has never existed, being able to bring up memories and all sharing the same information, contrary to these things never actually existing. They remember specific dates, pictures, places, etc, but nowhere is evidence to be found.
One theory is a sudden dimensional shift that causes some people to be phased into a new reality where things are different, but only slightly, such as the blackout, having created an alternate universe. Jack (and others) suddenly wake up in a world much like their own, but only certain events have not happened.
Another possible idea is that someone has traveled through time to stop some things from happening and only some people still remember, despite a shift in the timeline, but this idea gets more 'sci fi' and doesn't mesh well with the theme of the movie.
It is very possible that some cosmic event caused Jack and others like him to remember things that "never happened" while the rest of the world has always been the same as it was when Jack and others arrived.
Again, this is all just a theory and I don't really have any specific evidence to support it, only by what I saw in the movie.