I don’t know where you took that from. It has been said that they are not branches in the git, svn sense and that you don’t need multiple(!) of them need them to communicate features between developers.
This is not helpful for the discussion I want to have in this thread. Please open a different one, if you want to discuss what channels are there for. You could also look at Phenomenological Pijul (or Pijul from the outside) again, where I wrote about what channels are.