I don't think WSL was dogmatic-you are in some of your posts You don't have to agree with me- but your dogmatism gets in the way of understanding what I sad.
I don't feel that I am dogmatic having done several types of wing chun and several different systems, both traditional and modern but I have to say that I have trouble understanding what you are saying as well. I get that you don't mean it to be this way, but many of your posts come across as being very general. If you could be more specific then that would be incredibly useful. Even if the details seem obvious to you, maybe they aren't to us?
In dahn chi sao -jut from fuk can be very fluid. Dan chi sao trains one hand at a time... but it leads to two handed chi sane can use one or two hands depending on context.
Jut as a first action can be a jut with one hand while simultaneously striking with the other, or a jut with one hand followed by something else with either hand. In the first case as LFJ said you are simultaneously attacking and defending but using 2 hands against a one handed attack. Is it not more simple to punch with jam elbow and cut the attack? In the second case you are blocking then countering, a 2 step process. Can you explain why the jut first action? When would you choose to use it particularly?