Agree with you 100% there.if I was to late to prevent the force for generating for what ever reason then I might have to borrow force but I would not yield so much to redirect, I would be moving off that center line of attack and going in at angles or behind.
I just came back from the 2016 Houston Kung Fu tournament last night. In the morning, I helped judging form. In the afternoon, I helped judging Taiji push hand, There were only 2 kind of Taiji PH there. The
1. fix step - if you lift up one foot, you lose.
2. forward backward steps only - if you move 1 foot side way, you lose.
Both rule set won't allow to "use your stealing step footwork to move yourself to be out of your opponent's attacking path and lead him into the emptiness at the same time". In Chinese wrestling, you want to let your opponent to occupy your space. You want to occupy your opponent's original space. In order to do so, the footwork is a must. This kind of Taiji PH rule just prevent your training to develop the proper footwork.
The Bagua system has plenty footwork, The XingYi system is also call 行拳 (walking fist) that emphasis on "even if you don't find opportunity to attack. You keep moving. When you move, soon or later, you will find opportunity to attack". IMO, The Taiji "yield" principle is contradict to the general MA "move yourself out of the way" principle.