Formatting the 2019 MBP to start over again. There's too much wrong with Big Sur for it to be useful at this time. Fortunately, I've learned some good things that will dictate how I go about upgrading in the future:

  1. Apple is dropping built-in PHP support, meaning local development efforts will need to be modified quite a bit
  2. Sublime Text does not (yet) like Big Sur and will show white text on a white background regardless of how you change the preferences, or you need to use a dark theme.
  3. Once a machine gets Big Sur, it's a Big Pain in the Bum to downgrade …