Think of it this way: "non-commercial" is undefined, it *will* block a number of different uses of your work that *you* would consider noncommercial, but the authors (and lawyers) might be afraid that could be considered commercial by a court.
Why define your work via the lens of whether or not something is considered commercial?
If something is licensed NC, and somebody breaks the license, do you make them destroy their work? Do you make them pay you? What if they can't afford it?
If somebody breaks an SA license, the only thing they need to do is release it under SA for everyone. Everybody wins.
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