Obviously you don't get it. Have you ever pulled a large camper or trailer of any kind? You can't stop very fast if the car in front of you slows down quickly. You don't need to worry about that as much following a semi truck. Does that still sound strange to you??
Yes....It does sound strange to me.
I've owned tractor/trailers since the mid 70's and been pulling travel trailers since before that, and I have never heard of anyone that thought that they should follow a big truck for that reason.
It makes no sense!
When I pull a large, heavy trailer, I want to have a clear line of sight as far ahead of me as possible so that I can judge my following distance accordingly.
What I do not want is a huge object in front of me blocking my line of sight....That is a recipe for disaster!
I have far more faith in my ability to judge what is a safe following distance based on what I can see ahead rather than rely on the judgment of some unknown guy driving the large vehicle in front of me who may or may not know what the hell he's doing .
We'll just have to agree to disagree here.