Do past kung fu masters really have the strength to compete with modern Sanda masters who often beat foreign players?

Don't talk about the game. Seriously, traditional Wushu is really not suitable for competition. In ancient times, Wushu was used in the battlefield. Life and death happened. If you win, you will be born. If you lose, you die. In the competition, you will be limited to death. The past martial arts masters can't be compared with the modern martial arts masters. That's not a level. The previous martial arts masters all had life and death experiences, and they all killed people.