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>Why isn't there just a plain `brew install task warrior`?

That would be `brew install task`. I'm guessing their thinking is that brew isn't part of OS X, though this is silly IMO. Homebrew is basically a requirement if you own a Mac and want to use the command line at all.

I just have task installed, 'brew install task'.

Running `brew info <formula>` for each of the three available formulae would have answered your question.

`brew install task` is what you want for the regular Taskwarrior.