Why don't people like the many-worlds interpretation of quantum mechanics?
The many-worlds interpretation of quantum mechanics is a controversial theory that proposes the existence of multiple parallel universes in which all possible outcomes of a quantum measurement occur. While some people find this interpretation fascinating and intuitive, others have criticized it for a variety of reasons. Here are a few possible reasons why some people might not like the many-worlds interpretation:

It violates Occam's Razor: Occam's Razor is a principle that states that, when given multiple explanations for a phenomenon, the simplest explanation is usually the correct one. The many-worlds interpretation requires the existence of an infinite number of parallel universes, which some people consider to be unnecessarily complicated.

It's hard to test: The many-worlds interpretation is difficult to test experimentally because it involves parallel universes that are not directly observable. While there are some proposed experiments that could support or disprove the theory, none have yet been performed.

It raises philosophical questions: The many-worlds interpretation raises a number of philosophical questions that some people find unsettling. For example, if every possible outcome of a quantum measurement occurs in a parallel universe, what happens to the notion of causality and free will?

It seems ad hoc: The many-worlds interpretation was developed to address some of the counterintuitive aspects of quantum mechanics, such as wave-particle duality and the measurement problem. However, some people feel that it is a hack that was created to avoid dealing with these problems directly.

It's not the only interpretation: There are many interpretations of quantum mechanics, and some people prefer other interpretations, such as the Copenhagen interpretation or the de Broglie-Bohm interpretation.

It's worth noting that the many-worlds interpretation has its supporters as well as its detractors, and there is ongoing debate within the scientific community about which interpretation of quantum mechanics is most accurate.