Well I guess it adds up in the sense if you're getting repeated blows regularly for a long time. A few weeks of hard sparring and then months of recovery after probably isn't as bad I imagine. There's a reason some fighters end up punch drunk and slur their words even after retiring.
I agree that it ads up. But a concussion is something more severe. Some light blows over the years is not the same as having 50+ pro fights.
If it was that easy to get concused I wonder how those guys who had 100 boxing fights ect still breath and talk.
It adds up but not that bad. Hard to say.
If someone wants to compete they might wanna spar hard a bit here and there to prepare them more for the real deal and gain more expirience that will alow them to avoid some damage in all out compeittion
Getting punched hard is not the fountain of youth, obviously.
But you're not gonna drop dead and have an IQ of 69 cause you spared controlled a few times monthly for some years.
It's all case to case basis.
Everyone gotta wage if the health benefits of exercise and the joy of it are worth taking some shots. How hard they wanna spar. And if they even wanna spar
If I could choose I'd spare often but Thai style, meaning technical but not hard. 100% effort is OK but lighter shots, especially to the head.
To me there's a threshold when strikes feel damaging. To a certain degree they don't really hurt, after a certain intensity they feel like they cause some damage. Now if you're a begginer at sparring every and any shot will feel like pain. After that many shots don't really hurt but a certain power level is felt to cause damage. I would always just chalk it up to getting better, not look for hard sparring but if some shots land hard just count it as realistic expirience.