“I’m hoping to show you how and why non-concepts like irreducible randomness have helped maintain the theoretical logjam that has prevented physics from reconciling quantum mechanics and relativity for about a century.” I believe you have this backwards. Quantum mechanics, like relativity and classical mechanics, is based on a deterministic mathematical foundation, where time is simply a mathematical coordinate. The time-dependent wavefunction is both reversible and deterministic. Science is rooted in empirical facts. Quantum interpretations struggle (and largely fail) to reconcile empirical randomness and irreversibility with the deterministic and reversible models of physics. The Copenhagen Interpretation simply says that measurements are random—now stop asking questions and go back to calculating probabilities. Pilot Wave theories invent unmeasurable and untestable hidden variables to restore determinism. The MWI says that everything that can happen does happen, but you can only access a single result—all other outcomes are unmeasurable and untestable. For a more in-depth discussion and testable alternative, see https://www.preprints.org/manuscript/202206.0353/v2