Perl 5 has an extremely mature, diverse, and vetted ecosystem, with 20+ years of Perl 5 code out in the wild that people use, maintain, and continually develop.

Perl 6 does not. It will hopefully one day, but come Christmas time, we're not all going to just drop Perl 5 and start coding Perl 6 exclusively. They're Sister languages; Perl 6 does not deprecate Perl 5.