Coupling, cohesion, DRY, KISS and YAGNI

An order status SMS copied into four places, a class that reaches through three objects, and a settings system built for options nobody asked for: DRY as one home per piece of knowledge, coupling and cohesion as how much a class must know and whether its parts belong together, KISS and YAGNI as the case for not adding it, and where each is over-applied.