It is also an excellent tool to have in your command line toolkit. Rather than | wc | uniq | sort etc, pipe to file and bring into SQLite for more extensive querying.
NoSQL provides command-line programs. sqlite is embedded in the same process. Error reporting across exec boundaries is much more complicated.
NoSQL requires standard unix command-line programs, and for at least one case "This program has only been tested with GNU sort" This makes portability to other OSes, specifically MS Windows but perhaps also OpenBSD, harder.
Hence there's no "simple" about using NoSQL for my use case.