synthetic rope on LT3000 winch

Aloha Guy’s, I am very new to all of this stuff so please excuse my stupid question’s, but why would it not be good to replace the wire rope on a super winch LT2500 or 3000 with synthetic rope? I called super winch today and the guy told me that you shouldn’t do that?? But he did not explain why. I have a grizzly 450 and want to get a winch for it and would like to have synthetic rope but am not sure if I need to spend the extra $$ for a terra. I don’t expect to be using the winch a lot. Thanks for the help.