But regardless, everything you have been saying so far leads us to believe that your "VT" would not do two-handed actions like a Tan Da, Biu Da, Gan Da, etc and would stick to the whole "blocking and striking with the same arm" approach.
I quite clearly said we have secondary, auxiliary, and remedial actions that use two arms, but they have a time and place. Most Wing Chun uses them at the wrong time and out of place.
THAT is why we keep asking about non-centerline, non-linear attacks, because THAT approach will not work in that situation. But you are too big-headed to concede this and acknowledge that you would actually use something like Biu Da when required. Of course I'm sure you also see something wrong with Biu Da as well!
I will not concede using something equally as stupid as
taan-da.
In response to round attacks, I've explained that we have strategy and tactics to diminish the likelihood and effectiveness of them.
Out of range, distance control will prevent round attacks and draw linear ones. When distance is closed, positioning and spatial dominance will greatly reduce the ability of the opponent to throw round attacks and weaken their effectiveness if attempted.
This is the answer to dealing with round attacks in general. It starts from fighting strategy, not a resort to remedial actions for the lack of intelligent strategy. The specific tactics used to accomplish this have been purposefully omitted.
In most circumstances, I will not be found in the position you probably find yourself in often. That is, walking straight-line in between the opponent's arms, thinking you must "occupy center" and then need to block round attacks left and right like Whack-A-Mole.
If I were to screw things up so royally as to be stood there like that,
biu-da would be as bad an answer as
taan-da.
The last thing I would want to do when standing between an opponent's arms facing a round punch coming at me, would be to reactively reach my arm out after it, chasing arms, and leaving my head exposed.
At close range, and in such a bad position, a blinding barrage of punches can come fast and having your arms outstretched like a zombie reactively chasing arms is
going to get you knocked out.
We had this discussion months ago. You obviously haven't been pressure testing your theory against serious punchers, or you would have come back with a broken face and a changed perspective.
A much safer and provenly effective method would be a
wu-sau adaptation for cover closer to the head while counter striking. In this case, we need a remedial action to fix our screw up of position.
You are using the wrong remedial action as part of your general strategy in a position you shouldn't be letting yourself get into. This is why imposition of intelligent fighting strategy is more important than reactive techniques to deal with this or that.