Personally, I see Flying Crane's point that if you really understand the theory of the art, then you can make it work regardless of range.
---And I don't disagree with that! But there is still the fact that some things work better at certain ranges than others! That's just simple common sense. There is still the fact that some martial arts methods were designed to work optimally at one given range. Again that's just simple common sense. Would anyone argue that BJJ wasn't created to function optimally on the ground? Or that modern TKD wasn't created to function optimally at a longer kicking range?
As for LFJ and Joy (Vajramusti), they seem to have found what works well for them within their lineage, as have I ... for the most part, anyway.
----And like I've said, there is nothing wrong with admitting that you are satisfied with how your system handles long range! You can be perfectly content with the idea that you can survive at long range enough to use closing skills to get to close range. But that is not the same thing as having a "long range game" that is the equivalent of what is done in boxing.
---And it seems to me that the people that are having a hard time admitting that their Wing Chun doesn't have a "long range game" just aren't being honest with themselves.