How We Lost 9 Months to Invisible Architecture Decay (And Fixed It in 3)

Architecture Decision Degradation (ADD) is the slow breakdown of system design caused by stacking “correct” decisions over time. In a real-world Redux app, this led to slice sprawl, race conditions, and a 42% drop in velocity. The fix: consolidate domain slices, introduce transaction-based state handling, and enforce single-slice selector ownership. ADD isn’t obvious—but it’s predictable and preventable.