Everyone’s first hand experience should just be ignored.
Thousands of years of martial combat end up meaningless because the UFC came out on TV 13 years ago.
I agree with your broad thrust here, but since some of us are nitpicking about science:
Wing Chun isn’t thousands of years old. A few hundred, more like it.
First hand and anecdotal evidence are not scientific proof. And many TCMA anecdotes are the subject of monstrous exaggeration, along the lines of Bruce Lee supposedly ripping a challenger’s heart out of his chest and showing it to him before the challenger died.
One of the problems of applying “science” to fighting is that it is probabilistic, not deterministic. Technique and training can move the odds in your favour, but it all still remains a gamble. Victory is never guaranteed, and that is why fights are best avoided.
“I returned, and saw under the sun, that the race is not to the swift, nor the battle to the strong, neither yet bread to the wise, nor yet riches to men of understanding, nor yet favour to men of skill; but time and chance happeneth to them all.”
While sportfighting is not a perfect laboratory for comparison of the effectiveness of styles, it IS closely observed by many, many people, and thus (more) difficult to “spin”, and about as close as you can get - legally - to real hand to hand combat.
The “not real because there are rules” argument doesn’t fly. If there REALLY were no rules, all my fights are going to be victory by shotgun blast while my opponent is getting out of his car. Why *****foot around with this “honourable” sh*t?