Thanks again for your reply Mr. Moose. Your experiences with the unprotected winch raising a snow plow 8" is typical of what I have been reading about. The who situation seems so avoidable. I think many folks do as you did, just be careful and don't over lift the blade. Easier said than done when you're working the winch, shifting forward to reverse and back, steering, and trying to avoid wheel slip. My bet your "super" rope will last a long time.
The factory electric hoists I'm familiar with had an arm connected to a rotary "limit" switch that cut power before the hoist wound tight. It was very robust method. It was all mechanical except for the switch itself. Electronics can be a problem on a hard working machine.
Here is another example of the magnetic "hall effect" lift limit switch that Warn sells. It looks similar to the one you got a couple of years life out of.
Some guys have rigged their winch with a nylon strap for the winter. It doesn't break, but the winch still sees full stall torque which can't be great for long life or battery life.
I will get something to shut down the winch before it stretches the cable and stresses the gear train every time I lift the blade.