Also a Mac user for nearly 2 decades. I don't care too much about most of the things mentioned in the article but I absolutely agree with you about the new System Prefs.
Another thing terrible about the Settings app is you cannot navigate it with the keyboard only (at least I have not figured out how). So if your Bluetooth mouse fails (which happens at least once a week for me) you can’t use a keyboard alone to correct it. Nope you have to fish out a wired mouse, plug it in, and then reset Bluetooth or whatever it takes to get the BT mouse working again. Madness.