Custom Metadata is often used to externalize configuration from code.However, it struggles when logic involves multiple conditions and outcomes.This limitation becomes visible as rule complexity increases.

Single-class Apex often feels faster when building small features.Over time, logic, SOQL, DML, and UI handling get tightly coupled.This makes the codebase fragile and difficult to extend?

Business rules often evolve gradually rather than changing all at once.Testing new logic without disrupting live processes is critical.Traditional Apex-based approaches make this risky.

In single-org projects, small shortcuts often feel harmless and efficient.When the same solution must work across many orgs, those shortcuts quickly become liabilities.This transition forces a deeper level of architectural discipline.