Meanwhile, my wife's Apple laptop fails to go to sleep if it's plugged into a Dell monitor via USB-C, instead it wakes up and dings every time it's about to go to sleep.
As always in Apple world, how well something "was nailed" depends on your exact circumstances, and when something doesn't work, you have no hope of ever getting it to work.
Meanwhile, my wife's Apple laptop fails to go to sleep if it's plugged into a Dell monitor via USB-C, instead it wakes up and dings every time it's about to go to sleep.
As always in Apple world, how well something "was nailed" depends on your exact circumstances, and when something doesn't work, you have no hope of ever getting it to work.