Against a good fighter, one style will not work. Even the BJJ guys who entered the first UFCs learnt basic techniques from other styles to assist them. Nowadays, there are very few 'pure' fighters in the more realistic arenas.
((We have different POVs- which is ok.Realistic arenas?The current cages?A form of sport))
DonÂ’t get me wrong - wing chun is a great art to learn and if you are in a close quarters situation (argument stage) then wing chun is extremely useful and practical, and one of the best styles out there for practical defence
((A well trained wc person is very aware of distance- close or far))
However, if you are grabbed, dragged to the floor or hit with power from long distance, traditional wing chun moves do not cut it
((Depends on whose wing chun and what kind of wing chun and the person involved))
The basic fact that if ‘pure’ wing chun worked brilliantly against practitioners from other styles, it would be all over youtube.
((So you tube is the new reality???))
You have to make your wing chun adaptable, sure, but you also have to understand the nature of other styles, as well as train that which wing chun does not give you -ground defence, clinch defence, and long range techniques
(Again depends on your wing chun.I am familiar with opinions like yours.Good luck with your wing chun mix))
This is true of all styles. I would never take any ‘purist’ seriously who claimed they did not need to cover groundwork/clinchwork/sparring etc