Thanks for the positive feedback, much appreciated!
I was just reviewing the EXCEPT query syntax at the top as it's the classic way to test for dataset deviations. I needed to set the context for situations where EXCEPT is appropriate before discussing where it's not.
In practice, if I were to run an EXCEPT query in some of the situations that I use the FULL JOIN, it would return many thousands of rows, with miniscule deviations. I can safely assume that the two datasets in these situations will never match exactly, which is why I go directly to the FULL JOIN technique to find the exact deviations.