Manual memory management via new and delete creates a fragile "contract of responsibility". The programmer must perfectly predict every execution path—including early returns and exceptions—to ensure resources are freed. This approach is prone to systemic failures.

The Systemic Failures

• The Leakage Trap: In complex logic (if-else, switches), failing to pair every new with delete degrades system performance over time.
• Pointer Invalidations: Errors like Dangling Pointers (accessing memory after deletion) or Double Frees trigger undefined behavior and security vulnerabilities.
• Exception Safety: If an exception occurs between allocation and deallocation, the delete is skipped entirely.

The Evolution

C++11/14 overhauled the <memory> header to move away from "naked pointers" toward automated ownership models that enforce safety at the compiler level.