High Memory Cost of Immutability is a Lie

A video transcript debunking the claim that immutable designs are memory-inefficient. Through benchmarks comparing mutable vs immutable models, it shows that naive comparisons are misleading. When both designs use proper domain modeling with small, composable types, the memory difference shrinks to ~10%. More importantly, immutable persistent objects can be aggressively reused across object graphs, potentially making immutable designs consume less memory than even the most optimized mutable (anemic) model. The key insight is the distinction between simple immutable objects and persistent objects that reuse existing instances instead of discarding them.