Critics of the Many-Worlds Interpretation argue that it is too... many.
Specifically, they claim that every possibility, no matter how improbable, must exist in some universe.
This leads to an infinite number of universes, making it impossible to test or prove any theory.
It's like trying to choose from an infinite number of options for your morning coffee: it's all just too much.
Other critics point out that the Many-Worlds Interpretation is just an excuse for people to say "it's not just one universe, it's infinite!."
But we say, "Hey, that's just it. It's a thing. Deal with it."
Learn more about the infinite regrets of the Many-Worlds Interpretation.
Or, if you will, the regrets of the multiverse.