True, but boxers who enter this game have to be aware of the risk, and he has to accept the risk. That's why they need to have the right training so they will be 100% ready and they can take the punches from their opponent. Referee has a big role in boxing, they have to make sure that they are doing their job well to protect the boxers and to make it a clean fight.
Their conditioning is crucial and also the weigh-in is carefully checked because the overweight can throw harder punches to hurt their opponent and can be fatal as what has happened in the last decades when they don't really care about their body weight back then. Right now they are extra careful and they even cut the maximum rounds to 12 to minimize the risk of unnecessary accidents. Furthermore, the boxers are aware when their opponents are not competitive when they hurt them so much and some of them ask the referee to stop the fight.
Which is really a concern that being address, way back they are just bringing the fighter in and let them showcase their fighting
skills regardless of if they've got same weight.
On that note, the danger on the opposing side is high so they segregate the divisions and let the same class to fight each other
and if they wanted to move up, there's a required requirements to meet.
The organization are really concerned to lessen the chance of an accident that may take place if the rules will not be implemented properly.
That's why the percentage of ring accidents and serious injuries before are higher. It's a good thing that after all those years, the organization has focused on wellness and fairness of the game so their players won't face a higher risk. We can't deny the fact that weight has a huge impact on the gameplay result so it should be fair from the beginning to make sure that the whole match would flow smoothly.