Callbacks & Callback Hell

To improve performance
To maintain consistent async behavior
Executing callbacks asynchronously even with immediate results is important because: 1) It maintains consistent timing behavior across all executions, 2) Prevents issues with code assuming asynchronous execution, 3) Avoids stack overflow in recursive scenarios, 4) Maintains consistent error handling patterns, 5) Prevents race conditions in code expecting async behavior, 6) Makes code behavior more predictable and easier to reason about.
To prevent memory leaks
To handle errors better