People talking about what number to set follow distance to. When I was 15 1/2 they taught up 1 car length for every 10 mph. There absolutely should not be a set distance as it varies depending on how fast you are going. The software knows how fast you're going and how far away the car in front of you is. It should be pretty simple but clearly nobody taught those developers the 1 car length per 10mph. I've seen nothing in the owners manual or written on here to suggest that numeric setting is not speed adjusted.
As already mentioned, the developers did think about it. You just didn't bother to read the comprehensive manual. That tells me a lot, actually.
if the car in front of you stops suddenly. That is physically impossible.
Nope. You're thinking of the word "instantly" not "suddenly". Stopping suddenly doesn't mean instantly stopping, it means they begin the process quickly without warning. Words have meaning, and understanding them is pretty important.
The last sentence is silly. How is anyone, much less a 16 yr old, going to measure what a 3 second stop distance is.
Again, you've misread the entire sentence. It doesn't say a 3 second stopping distance, it says a 3 second following distance. This is all very telling still. You've interpreted the words to mean what you want them to mean. And since you're calling the authors the "woke generation", I'm guessing you believe that somehow those authors' advice is less valuable because they're younger than you?
Either way, judging a 3 second follow time is pretty simple. If you can't do it, you shouldn't have your driver's license.
Seconds are a measure of time, distance is a measure of space.
This is going to bake your noodle, but speed is a measurement of distance over time, and the blurb you quoted is describing how to properly adjust your speed in a situation where you're following another vehicle. Poor weather conditions increase stopping distance and therefore stopping time. So adjust your speed accordingly.
Maybe the real problem here is that this "woke" generation you're speaking of has the ability to understand complex examples given in a certain context? Or, maybe they just read the complete sentence instead of pre-judging what the sentence is going to tell them.