I have nothing but respect and admiration for those WC practitioners who have spent time working with legitimate skilled grapplers to develop and test methods for making their art work against grappling. Some of the WC exponents on this board, such as yak sao, say they have put in that time. Kudos to them! Some WC folks on YouTube, such as Mr. Izzo and Mr. Young, have clearly done the same. Kudos to them as well.
Where I can not offer commendations is for those practitioners of WC (or any other art) who have elected to offer instruction on fighting against grappling which is clearly based on armchair theorizing and has not been tested with actual grapplers. I don't get as riled up about it as Hanzou does, because I understand that Sturgeons Law certainly applies to martial arts and it's not my job to police the 90%.
Suppose the countryside was being ravaged by roaming gangs of rogue Wing Chun practitioners and so I felt compelled to develop a specific "Anti-WC" curriculum. I might have some ideas about tactics and techniques to try based on my (minimal) live exposure to WC, my experiences sparring with other types of striking styles, and various videos of WC practitioners fighting other people. Possibly some of those ideas might even be valid. If I started offering instruction based on those untested ideas, I would be a fool. Before I started presenting myself as an expert on the subject, I would need to find a bunch of skilled WC practitioners to work with, preferably from different lineages, and spend some serious time testing and refining my approach to the topic.