I had a grade 3/4 around 5 years ago I think. After about 2 weeks I was 70% fine again and shortly after that I was 100%. The only lasting problem I have is it's a bit uncomfortable to sleep on that shoulder now but apart from that I'm 100%. I have a bump from the clavicle sitting in a raised position but have no discomfort or pain at all. From what I understand regarding surgery is depending on the severity of the damage it is mostly aesthetics to get rid of the bump and put your clavicle in its place again. If surgery is not required I wouldn't bother with it.
Definitely work on shoulder strength and mobility for your shoulder health in the long run.
