Here are some things I feel are limitations, but I'd wouldn't say any of them are the greatest limitation.

• Introspection and reflection are difficult
• SUPER:: is flaky
• No real macros (not source filters)
• No user available scoped $^H hints
• Common attitudes of non-Perl folks to Perl (write-only language, not a "serious" language, unix only,etc)
• Only perl can parse perl (AST access?)

Perl 6 looks like it will clean all of these up.

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