Unzipping directly and unzipping into a folder and copying should theorectically be the same. I would expect if there were any issues unzipping and overwriting winzip (or 7z whatever you use) would tell you if there were any violations etc.
Very odd. Not saying you're wrong but i cant think of a reason for it.
Anyway as it happens I always extract a new release in a seperate hotfix folder anyway. Always seems the safest way to me.
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