The Many-Worlds Interpretation (MWI) of quantum mechanics is just one of several interpretations put forward to explain the nature of quantum phenomena. While it has gained some popularity, it is not universally accepted among physicists, and there are alternative interpretations as well.
The MWI, proposed by Hugh Everett in the 1950s, suggests that when a quantum measurement occurs, the universe splits into multiple branches, each corresponding to a different outcome of the measurement. In this view, all possibilities are realized in different parallel universes, including different versions of oneself and loved ones.
However, it's important to note that interpretations of quantum mechanics are philosophical in nature and go beyond empirical testing. As such, the choice of interpretation is a matter of personal preference and philosophical inclination. Different physicists may have different interpretations, and there is ongoing debate and discussion in the field.
Other interpretations, such as the Copenhagen interpretation, which emphasizes the role of the observer, and the pilot-wave theory (also known as de Broglie-Bohm theory), which posits the existence of hidden variables, are also widely discussed and debated. These interpretations aim to provide alternative explanations for the same experimental results.
Regarding recent discoveries, it's important to clarify that interpretations of quantum mechanics are not typically influenced by specific experimental findings. Instead, they are more influenced by philosophical and conceptual considerations. Experimental results in quantum mechanics tend to confirm the predictions of the theory itself, rather than favoring one interpretation over another.
Ultimately, the choice of interpretation is a matter of personal perspective and the philosophical framework one finds most compelling. While the Many-Worlds Interpretation has its proponents, it is not the only interpretation, and there is ongoing exploration and debate within the scientific community regarding the nature of quantum mechanics.