I know many bros that did/do predominantly bench. It's the only thing they care about. They basically train to hit a 1RM. One has had shoulder surgery, most just complain of rotator and shoulder pain. Many quit the gym eventually.
So not sure whether your back is equally as strong etc but like with everything in life, moderation and balance trump excess. 1RM are pretty useless in terms of iliciting adaption and changes in your body, not to mention injuries.
Still, well done. 100kg at your bodyweight is awesome.