It is as much about the commander clearly explaining his intent and plan as it is for the subordinate to carry it out with minimal further direction. But as it is said even the best plan rarely survives contact.

I agree that “turning off the radios” is a bit much plus our over reliance on technology is not so much radios as it is those things that replace solid field craft, like GPS. While GPS is a great thing the art of map reading and navigation using the compass are falling by the wayside. That is an over-reliance on technology. Comms are comms and short of wig wag and heliograph there's not much else you can do to replicate them.