... at least they did not snip the grounding conductors. Some old timers liked to do that.
My dad (b.1932, no formal training) is like that, but with a curious variation:
He refuses to connect grounding conductors -- "It works just fine without it" -- but doesn't snip them off. He bends them back, wraps them around the outside of the cable jacket and tapes them out of the way, in case somebody else might want to use them at some point in the future.
In the distant past, I've asked his reasoning but never received a comprehensible answer. I suspect this practice originates either from a lot of years in Chicago, where EMT is required in residences, or his work in oil refineries, where vapor-tight rigid conduit and threaded cast conduit bodies are required, or his work with instrumentation and the many folk legends & fairy tales about ground wires and hum.