I spent six months breaking a monolithic automation script into plugins. The biggest benefit wasn’t “better extensibility”—it was “being willing to make changes.”

The biggest cost of a monolithic system is psychological: you know that changing one thing might break three others, so you end up changing nothing.

Once it’s broken apart, every module can be replaced, turned off, or rewritten. The system earns the ability to keep evolving.

To judge whether an architecture is good, look at how many mistakes it lets you make.