thoughts about car battery keep hooked up OR disconnect ?

After having my exhaust bent/installed and getting some help with a few other things when getting the Dart back on the road, the owner of a local well respected restoration shop (and diehard Mopar guy) firmly suggested that I disconnect the battery any time that the car is going to sit. With half-century old wires, there’s always the possibility of a short somewhere that could result in a tragedy...and this guy sees a lot of old cars.

I realize that plenty of folks here have equally valid perspectives on the matter but there was something in his statement that made me believe that he had seen direct evidence of this danger. I believed him. My car is never parked for more than a few hours without being disconnected.