Why are Perl 5's function prototypes bad?

Question

In another Stack Overflow question Leon Timmermans asserted:

I would advice you not to use prototypes. They have their uses, but not for most cas

Answer 1

I agree with the above two posters. In general, using $ should be avoided. Prototypes are only useful when using block arguments (&), globs (*), or reference prototypes (\@, \$, \%, \*)