Thread Promotion

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This is an ever evolving topic, there's a lot to cover that hasn't been already. While we're reading taoup for the bookclub I realized that there's a lot more to add.
For example, in the type of interaction, I've listed above: input, output, sink, pipe. But I'd like to add phillbush's idea of "interactive filters" instead of non-interactive ones.
And also emphasize too the grouping/bundling of related commands to reduce the cognitive load on users. What some call the subcommand interface.

What do you think? What other criteria or ideas that should be emphasized to make a good CLI?