Reflection: Living in the Multiverse

Prompts to consider

• If Many-Worlds is true, then every decision you make that has quantum-sensitive consequences, which, given chaos theory, is probably every consequential decision, spawns a version of you that made the other choice. What does this do to regret? If there is a branch where you made the 'right' choice, does that console you for the branch you're in, or does it make regret worse? What does your reaction reveal about the foundations of regret?
• The measurement problem shows that quantum mechanics, our best physical theory, doesn't have a settled, agreed-upon interpretation after nearly a century. Scientists use it successfully every day without resolving this foundational question. Is this a scandal, or is it an acceptable form of theoretical progress, keeping the foundation messy while the superstructure works? Are there other domains in your life where you operate successfully on an unresolved foundation?
• If you take Many-Worlds seriously, you exist as one branch of a vast tree of versions of yourself, each having made different choices, experienced different events, developed different characters. Does contemplating this tree of selves make your own choices feel more significant (you are uniquely you, in this branch) or less significant (there are versions of you for every outcome anyway)? Which feeling seems philosophically better-grounded?