its not controversial to use the multi world model in the less wrong forums and that most people I respect use it fully
the key word is “in the lesswrong forums”. This is because Eliezer Yudkowsky, the founder and the main contributor for a long time, promoted both MWI and Bayesianism as cornerstones of rationality. Neither is necessary for either epistemic or instrumental rationality, but they are useful reasoning devices. No one really “uses” those directly to make decisions in life, even though most people pretend to. In actuality, they use those to justify the decisions already made, consciously or subconsciously. The reason is that the Bayes theorem relies on evaluation of probabilities, something humans are not very good at. At least not until you spend as much time as Eliezer, Scott and some others on self-calibration. And MWI is generally used as a fancy name for “imagine possible outcomes and assign probabilities to them”, which has nothing to do with physics whatsoever, when it is not misused for discussing quantum suicide/immortality, or, well, to justify anthropics.
the key word is “in the lesswrong forums”. This is because Eliezer Yudkowsky, the founder and the main contributor for a long time, promoted both MWI and Bayesianism as cornerstones of rationality. Neither is necessary for either epistemic or instrumental rationality, but they are useful reasoning devices. No one really “uses” those directly to make decisions in life, even though most people pretend to. In actuality, they use those to justify the decisions already made, consciously or subconsciously. The reason is that the Bayes theorem relies on evaluation of probabilities, something humans are not very good at. At least not until you spend as much time as Eliezer, Scott and some others on self-calibration. And MWI is generally used as a fancy name for “imagine possible outcomes and assign probabilities to them”, which has nothing to do with physics whatsoever, when it is not misused for discussing quantum suicide/immortality, or, well, to justify anthropics.