[lunixbochs]

Fixed commands are fast, precise, and predictable.

Assuming you mean speaking in natural language, that's slower to say, and likely less precise and predictable if you want to be able to just say "anything" any have a result.

You need a command system either way. If you want to express some precise intention, you need to understand what the command system will do.

There is a combined "mixed mode" system I've been testing in the talon beta where you can use both phrases and commands without switching modes.