Because Perl 6 is an incomplete language still in development that, in all honestly, has no chance of ever replacing Perl 5. It's been in development since 2000

Because Perl 6 is an incomplete language still in development that, in all honestly, has no chance of ever replacing Perl 5. It's been in development since 2000 and is a spec with no "official" implementation. Perl 6 is so different that it might as well be considered a different language. Hence, "real Perl" is Perl 5 and Perl 6 should be called something else.