Would you consider Linux 2.6 'bleeding edge'? I mean, they have kept the 2.4 series going. Just because some development occurs in parallel, doesn't mean the new version is 'bleeding edge'.

The Python 3 migration process, for actual Python software in the wild, is and has always been meant to be a multi-year thing. As such, Python 3 is still very much "bleeding edge" in the sense that most projects are still working on their migration, and likely will be for some time.

I don't understand why more people don't get that. Guido has always said it will take a few years for it to all get over to P3. The Django folks are just now deciding when to get Django over to P3. If I have been watching the release notes for P3 versions as they come out and it still seems they are "cleaning up".

You're correct, but you misunderstood me:

I'm not saying it's bleeding edge because they're developing in parallel, I'm saying they're developing in parallel because it's bleeding edge.

It's bleeding edge because the developers explicitly refer to it as "the shiny new thing", etc.