I didn’t have the surgery - against the advice of a surgeon - and it’s taken me almost two years to regain most of the movement in my shoulder, with intensive physio. Rotation remains a problem that I am still working on, and I don’t, and may never, have the full range of motion. I still have some pain, but it’s intermittent and never as severe (touch wood!) as it was.
That doesn’t mean, of course, that this would be the right course of action for you. If you are unsure, you are entitled to ask for a second opinion.