In thise case, '5 widgets max' would be a parameter that should be defined as a global constant instead of having a hard-coded 5s all over the place or, worse,

In thise case, '5 widgets max' would be a parameter that should be defined as a global constant instead of having a hard-coded 5s all over the place or, worse, pieces of code copy-pasted 5 times... That's a standard good coding practice.