Just had surgery a week ago
Same as some of you, I had a grade III separation in late October. Healed ok, with the bump, and was able to do all daily activities including weightlifting, which was somewhat painful. Since I had to have surgery to fix a subsequent Colles wrist fracture, my ortho surgeon also thought it made sense to fix the shoulder too.
He shaved off some of the clavicle and reattached it with an internal fixation. It hurts a fair bit but know I will avoid arthritis in the joint far longer. I should be back riding in a few weeks once PT is done. I think it was worth it but I am not sure if I would have done it without also needing the wrist operation.
Good luck with whatever you decide!