What really kills those (and especially the PRC units) is the seal. Or lack thereof.
Brake fluid into contacts doesn't work well. In fact, Ford Explorers had a recall on switches for disengaging cruise, was a hydraulic switch like the ones shown, no fuse...and the brake fluid leaked into the switch, and in the middle of the night the car could torch off.
New switch and fuse for the line.
Ours has no cruise, has no switch, they did the recall anyway. Got a fuseholder with no fuse, the wire is taped off, goes nowhere.
Anyway, DOT5 will REALLY kill them fast.
I restored a 1950 Ford Convertible for a guy many moons ago, insisted on DOT5 in the all-new hydraulics...and he went about six weeks on each stoplight switch, until we finally did a non-hydraulic switch under the floorboards with an arm.
So it's an area of concern with DOT5 and especially aftermarket switches.
Your mileage may vary, depending on the age of the coil.