This particular fight was for sport- our beef is mostly joking.
I had never done this before, but we chose this mode to reduce concussion risk as you said. I would say that it worked, as compared to any form of gloved sparring or fighting we both took far less impacts to the head.
The two issues are finger injuries from punching and lacerations, especially on the face. Hang wraps and careful observance of good form reduce the risks of the first one, the second just requires even more care than usual with regards to hygiene and making sure nothing gets infected.
Libgen isn't dead? A couple mirrors show 502 errors, but others don't and can be accessed normally