I agree by and large with most of your posit..
"B.F.", is a term thats often used in refernce to the " swing " dances, and is more apparent in FT than the other 2 ( it is there in the other 2,but in shorter "bursts " ) ..
Why in FT ?..because we have the opportunity, with the variations available even at a basic level, to try and create a "seamless " and continuous motion, thruout the dance .
The dynamics of FT, are perfectly suited to illustrate, even to the inexperienced eye , the illusion that one is floating across the floor in perpetual motion.. the hallmark of top class dancers..