Why is it that Wing Chun people need to learn about grappling but grappling people don’t need to learn about Wing Chun?
I once talked to a Wing Chun teacher who also taught Capoeira. He said Wing Chun people could handle Capoeira if they understood it. However Capoeira people didn’t need to learn about Wing Chun to handle Wing Chun.
In the Hong Kong days, Wing Chun people had success against the other Kung Fu systems without having to learn about those systems. (probably open to debate since Western boxers do study the tactics of other boxers).
Of course on the other hand it’s always good to learn as much as one can about any kind of fighting if one has the time. Then again one has to weigh the benefits of training say 10 hours of Wing Chun vs 5 hours of Wing Chun and 5 hours of BJJ or 5 hours WC or 2 hours BJJ and 2 hours Thai boxing and one hour of Escrima.
I would say it’s all about balance. Of course those who can fit in a lot are better off.