(More seriously, slow performance, missing features, bugs, etc. were part of the reason for not calling it "1.0", but I would agree that to be really successful, the language needs a release that is called 1.0 and acts like it.)
6.c was described, both before and after its release, as being the “1.0” release of the Perl 6 language.
> More seriously, slow performance, missing features, bugs, etc. were part of the reason for not calling it "1.0"
No, they weren't.
The first “production-ready” release of Rakudo Star release was shortly after the 6.c spec release, in version 2016.01 (Rakudo Star uses date-based versions numbers.) If they were using semver-ish numbering for Star releases rather than dates, this would have been the 1.0 implementation (as opposed to spec) release.