Originally Posted by
Wintermoot
That's one reading of the story. Here's another that skews closer to the actual narrative of the movie.
Shang-Chi was FORCED to learn martial arts while being tortured for seven years from 7 to 14. It's not something he actively sought out. Something he had begrudgingly forced upon him. I would expect someone enthused to learn martial arts who put effort into learning it to be a better student than someone being forced to do it.
Add to that that, by all appearances, Shang Chi STOPPED training at 14 years old and spent 10 years drinking, working minimum wage jobs, slacking off and trying hard to lose everything he had learned whereas his Sister spent those same 10 years honing her craft, continuing her training and participating in non-practice cage fights in order to get stronger and better.
Yeah, I wonder why she might be better than him. If anything the movie UNDERSOLD how much better she should be than him.