I have the opposite view. If I used my winch more frequently I might favor wire for its ultimate abrasion resistance. But winch use is infrequent, and so abrasion degredation of the synthetic rope - it's worst enemy in my experience - is minimal. The longest I have had a synthetic rope on one of my Jeeps is four years, and when I sold the Jeep the rope was is great shape. Using the chafe gaurd on the last wraps keeps almost all of the sun off, and there are simple, easy to use sun gaurds available to, or make a velcro on version DIY.
In my experience, the removal of the ~35-40lbs of wire and steel roller fairlead weight off the very front of the Jeep leads to a better riding Jeep, and I drive a heck of a lot more than I winch.
JPK