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?
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Monolithic Apex violates separation of responsibilities and quickly turns hard to manage.
Debugging becomes slow because business logic cannot be isolated or tested independently.
Small changes start creating unexpected side effects across the class.
This pain point is commonly discussed when exploring .