Martin, you'd find a synthetic is every bit as durable if not more so. I went through three wire ropes on my winch from kinks or the wire digging down on successive pulls & breaking strands. You can't always rewind a wire rope before needing it again on the trail.
Since replacing my last damaged wire rope with 3/8" synthetic rope 5 years ago, I have yet to need to replace the synthetic. Wire rope has no benefit for most wheelers and you will seldom see a wire rope on a winch that gets used a lot on a serious trail rig any more.
On hydraulic winches, just wait until you need it when you can't start your engine. And if you say that would be rare, it's not as rare as you think. In fact, I have had to winch myself three times when I couldn't start the engine and it's a good thing I had an electric winch. Once when my power steering pump blew a seal & starting the engine would have blown the rest of the PS fluid out of the system & all over the trail. The other two times, the engine simply wouldn't start. Bad ignition coil and bad CPS the other two times. No, I did not need a jump start afterwards. You can safely winch yourself 5-10 minutes on just a single good quality battery alone & still be able to start the engine once you get the issue resolved. Not to mention that heat is a non-factor on synthetic ropes anyway for 99.999% of us. The ONLY time a winch hub develops any heat at all, which is what a few worry about after seeing warnings about synthetic line, is if you are using the winch as a brake for a backwards descent. For all normal winching
, the brake inside the winch hub develops no heat.
Not to mention that a hydraulic winch is so slow that when used as an assist on a tough trail section, it will snarl the winch cable during those brief sections you can drive faster than the winch can retrieve. In those situations, a hydraulic winch can almost be worse than no winch at all.
After having won a brand-new Milemarker 2-speed hydraulic winch at a 4x4 event, I sold it to keep my trusty old Warn winch.