What Modularity Actually Means
A modular object is composed of discrete units that can be separated, replaced, or recombined without affecting the whole.
This separation only works when interfaces are stable and well defined.
When Modularity Supports Repair
Modularity enables targeted repair. Failed components can be isolated and addressed without disturbing adjacent systems.
This reduces repair time, diagnostic effort, and collateral damage.
The Cost of Over-Modularity
Excessive modularity increases part count, interfaces, and points of failure.
When every function is isolated, systems become fragile rather than resilient.
Permanence as a Counterbalance
Some assemblies benefit from permanence. Structural elements, alignment references, and load-bearing parts often perform better when fixed.
Repairable design balances modular access with structural continuity.
Designing the Boundary
The repair value of modularity lives at the boundary: connectors, tolerances, alignment features, and wear surfaces.
Poorly designed interfaces negate the theoretical benefits of modular systems.