Welcome to the forum Sidney. Forcing cone erosion comes with the territory when using magnum loads in most wheel guns. Large charges of slow ball powder can increase it, and Lil Gun powder has that reputation in particular with some magnum shooters. Even "starting loads" with this powder are "hot".
In magnum revolvers, I have found forcing cone erosion, along with flame cutting of the top strap to be normal, usually self limiting, and can be minimized by using smaller charges of faster burning powders in most loads where maximum power is not needed. S&W does have a factory lifetime warranty on these revolvers if forcing cone erosion should become a factor to the point accuracy falls off, or leading increases. Re-cutting the forcing cone with a 10 - 11 % angle is popular with some shooters as it reduces slightly the erosion issue, and makes for a more consistant bullet entry into the barrel. I have never had it done, as these issues have never really been "issues" with my big bore revolvers in .44 mag. Polishing the forcing cone may slow down the erosion process, but remember, any material removed from the forcing cone cant be replaced, and excessive barrel / cylinder gap could be an eventual result.
Me? I'd shoot mostly target level loads out of it, and not worry until I had to, then let S&W fix it for free if it came to that. I suspect that you have already fired more magnum level loads thru this gun than most .460 / .500 owners do in a lifetime. You see plenty of abused guns around, but how many do you see that are truly mechanicaly worn out?
Personal opinion is a good thing, and everyone is entitled to one. The hard part is separating informed opinion from someone who is just blowing hot air....