Maybe if the fighters wear face masks during the fight they will bring back 15 rounds. That seemed to solve America's problems the past 2 years.
Not sure why you gave that as an example. Leonard was on his toes and bouncing round the ring in the later rounds. He had also proved many times that his heart and will to win was unquestionable. I think that 15 rounders would have come in very handy in recent years to sort out winners. Both of the Canelo vs GGG fights could have done with another 3 rounds for sure and one also wonders what would have happened in Fury vs Wilder 1 with another 9 minutes.