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I had never heard about that "tailored" business, and I question how accurate that is.

See Topher Kessler's Differences between update options for OS X which spells it out as far back as Snowy:

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Apple's Software Update utility is the most common and recommended method for updating your Mac. It is available in the Apple menu and will analyze your system for the files you need in order to apply the latest updates. This is beneficial because it minimizes the download size, consolidates multiple updates into one update routine, and performs the update automatically. (Emphasis added)

The new Great Equalizer is the SEND button.

In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire