I got into Perl in the early 90s in the Perl4 days, watched the very weird but necessary Perl5 come into focus, then I saw Larry and the community in the 2000s get stars in their eyes and just throw it all away for the dream of Perl6.

The real issue is not just that Perl6 wasn’t backwards compatible, it was that Perl6 basically did not exist for real for many, many years. People got tired of waiting, and the lack of backwards compatibility did not help.

Also Perl6 was just more weird on top of weird from a mainstream perspective. Making it even harder to justify.