How is Bazaar-NG related to Bazaar and Arch in general?

[ser at germane-software.com]

> Canonical's working on Bazaar, because they need a distributed revision
> control system that works *now*.  They've got a bunch of infrastructure
> that uses Arch, and they won't want to drop it all at once in favour of
> bzr, which is still experimental and doesn't yet support their needs.

This is what I don't understand.  They can continue *using* Bazaar without
put resources into developing new features for it.  Adding Bazaar-NG
support to Bazaar seems -- to me -- like a non-trivial amount of effort;
effort that might be better invested into bringing Bazaar-NG up to the
point where it *does* support their needs.

In any case, it doesn't really matter, much... I was simply curious.

--- SER