In a nix.dev tutorial, I read:
Channels are a way of distributing Nix software, but they are being phased out. Even though they are still used by default, it is recommended to avoid channels and
<nixpkgs>by always setting
NIX_PATH=to be empty.
Unfortunately, the link only discusses the concept of channels.
I would like to understand the rationale for phasing out channels and the planned replacement.