The point is control. Eval-based dispatch is much like an unstructured goto $EXPR - you cannot really be sure of the program flow. An explicit hash lists all locations where the code is allowed to branch to. This prevents malicious attacks where the attacker could try to make a call to the exit or system core function and it allows much better error handling. It also decouples the subroutine name from the argument, which I find very convenient in web applications.
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