The upgrade went surprisingly well except that Apple experienced some server problems for a few hours after the release.
I upgraded my old dev machine, a 2014 11-inch MacBook Air first, and then I upgraded my current dev machine, a 2020 27-inch iMac.
I confirmed the warning that Apple would be removing PHP, and was a little sad that it was still PHP 7.3.
Later I used Homebrew to install PHP version 7.4.
Homebrew updated and upgraded without warnings for this purpose.
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